What foods are deadly to cats? Cat eyeing their owner's food

What Foods Are Deadly to Cats? 43 Human Foods You Must Not Feed Your Cat

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Last Updated: April 28, 2024

Although we find it funny and cute when we see videos of cat owners sharing their food with their kitties, the truth is that many of the foods we eat are dangerous to them, and from this perspective, these videos aren’t really funny. I think it shows some irresponsibility on the part of the owners—putting their cat in harm’s way for the sake of views and likes. So what foods are deadly to cats, you ask?

Well, here’s a list of all the foods I could find that are deadly to your cat. Although the term “deadly” may seem a bit exaggerated, like some of these foods can be tolerated by cats in small amounts, I still included them here because your cat will already experience a lot of health issues during their lifetime, so why add these toxic foods to their potential list of problems, especially when there are loads of other foods you can give them that are safe for them?

What Foods are Deadly to Cats?

1.    Alcohol and alcohol-containing foods or sauces

Alcohol is a substance that can affect the central nervous system, liver, kidneys, and blood sugar levels of animals. It can cause symptoms such as vomiting, diarrhea, weakness, difficulty breathing, tremors, seizures, coma, and even death.

The amount of alcohol that can be harmful to cats depends on their body weight and the type and concentration of the substance, but even a small amount can be dangerous for them.

Alcohol poisoning can occur when a cat ingests just one teaspoon of ethanol, which is the most common type of alcohol found in beverages and other products. It can slow down their nerves and muscles and interfere with other chemicals in their brain. It can also damage their liver and kidneys, which are responsible for removing toxins from their body. In addition, it can cause dehydration and low blood sugar levels, which can affect their energy and metabolism.

2.    Allspice

Allspice contains a compound called eugenol, which can damage the liver cells and interfere with the blood clotting process in cats. It can also affect your cat’s nervous system and cause symptoms such as muscle weakness, trembling, and seizures. It can interfere with the cat’s neurotransmitters, which are chemicals that carry messages between the brain and the body.

In addition, some felines may be allergic to allspice and experience symptoms such as itching, swelling, and sneezing. It can also irritate their mouth, throat, and lungs, causing inflammation and difficulty breathing. Even a small amount of allspice can have a big impact on their health.

3.    Apple seeds

Apple seeds, along with the stem and leaves, contain a substance called cyanide, which is poisonous for cats. It can interfere with the ability of the blood to carry oxygen, which can lead to suffocation and even death. It can also damage the liver and kidneys, which are responsible for removing toxins from the body.

The amount of cyanide in apple seeds is very small, and your cat would need to eat a lot of them to reach a toxic level. However, even a few seeds can cause a stomach upset or an allergic reaction in some cats, so it is best to avoid giving them any apple seeds or any part of the apple that contains them.

The flesh of the apple itself is not toxic for cats, and it can provide some fiber, vitamins, and antioxidants that can benefit their health. However, it is high in sugar and carbohydrates, which are not essential for them and can cause obesity, diabetes, or other health problems if eaten too often. Therefore, you should feed them apples as an occasional treat or supplement and not as a main or regular source of food.

4.    Asparagus

Although not entirely toxic to cats, asparagus can cause several health problems, such as urinary tract infections, digestive troubles, and allergies.

The primary risk to a cat who eats asparagus regularly is its high alkaline content. While it is safe for them to eat this vegetable in small amounts, too much can adversely affect their urine’s chemical makeup and, over time, lead to urinary tract blockages, which in turn can cause pain, infection, and even death. In this regard, felines who are prone to urinary issues (especially females and older cats) should avoid eating it.

Another problem with this vegetable is that it can cause digestive troubles. Asparagus is high in fiber, which can be beneficial for humans but not for cats. These fur babies have a short digestive tract that is not designed to process plant matter efficiently. As such, asparagus can cause gas, bloating, diarrhea, and constipation.

Additionally, it can cause allergies or intolerances in some cats. Some felines may be sensitive or allergic to this vegetable or its components, such as asparagusic acid or sulfurous compounds, which in turn cause symptoms such as itching, swelling, sneezing, coughing, or vomiting.

5.    Avocados

Avocados are dangerous to cats because they contain a chemical called persin, which is found in all parts of the avocado plant, including the leaves, fruit, seeds, and bark. It is a natural fungicide that protects the avocado from fungal infections, but it can also harm cats if they eat it.

Persin can cause two types of problems for cats: cardiac and digestive. At the cardiac level, persin can cause fluid to accumulate around the heart, leading to congestion and breathing difficulties. At the digestive level, it can cause inflammation of the stomach and intestines, resulting in vomiting and diarrhea. In extreme cases, persin can even cause death.

The amount of persin that can cause toxicity in cats is not known, but it is better to be safe than sorry. As such, it is advisable to keep avocados and avocado plants away from your cat and to never feed them any part of the fruit or plant. If your cat accidentally ingests some, you should monitor them for any signs of poisoning, such as vomiting, diarrhea, difficulty breathing, or lethargy.

6.    Baby food

One of the main dangers of baby food for cats is onion and garlic. These are common seasonings in many baby foods, but they are very toxic for cats. I will talk more about garlic and onions later.

Anyway, another problem with baby food for cats is the lack of essential nutrients. Cats need a high-protein diet that is rich in taurine, an amino acid that is vital for their heart, eyes, and brain. However, baby food does not provide enough taurine for them and can cause serious health issues if fed as their main diet. In addition, it contains too much sugar, carbohydrates, and vegetables that are not suitable for them. These can cause obesity, diabetes, and digestive problems.

Finally, some baby foods may contain harmful levels of heavy metals, such as arsenic, mercury, or cadmium. These can accumulate in your cat’s body over time and cause organ damage or cancer. A recent study found that one in four tested baby foods had dangerously high levels of heavy metals. Therefore, it is not safe to feed your cat baby food on a long-term basis.

7.    Breadfruit

Breadfruit belongs to the same plant family as the Swiss cheese plant, which is also known as the Mexican breadfruit or the cutleaf philodendron. This plant contains insoluble calcium oxalates, which are needle-like crystals that can irritate your cat’s mouth, throat, and stomach.

If your cat bites into a breadfruit or any part of the plant, they may experience symptoms such as a burning sensation in the mouth, pawing at the mouth, excessive drooling, difficulty swallowing, vomiting, abdominal pain, and lethargy.

In severe cases, breadfruit poisoning can also cause fluid accumulation around the heart, muscle spasms, seizures, kidney failure, or even death. As such, it is very important to keep breadfruit and breadfruit plants away from your cat and to never feed them any part of it.

8.    Caffeinated drinks (cocoa, coffee, tea, and energy drinks)

Caffeinated drinks are high in caffeine, a substance that affects the heart and the brain. Cats cannot metabolize caffeine as fast as humans, so it can accumulate in their system and cause poisoning. It can cause symptoms such as increased heart rate; irregular heartbeat; high blood pressure; muscle tremors; seizures; coma; and even death.

The amount of caffeine that can cause toxicity in cats depends on the type and amount of drink, as well as on their weight and health. For example, one cup of brewed coffee can contain up to 200 mg of caffeine, which is enough to kill a 10-pound cat. Even a small sip of coffee can be deadly to your kitty.

In addition, caffeinated drinks can contain other ingredients that are unsafe for cats, such as sugar, artificial sweeteners, or additives. Sugar can cause obesity, diabetes, and dental problems, while artificial sweeteners, such as xylitol, can cause a severe drop in blood sugar, liver damage, seizures, and even death.

Likewise, additives, such as taurine, guarana, or ginseng, can cause adverse effects. In addition, some drinks may have wrappers or cans that can cause choking or intestinal obstruction in cats who swallow them.

Finally, caffeinated drinks can cause dehydration and electrolyte imbalance. Caffeine is a diuretic, which means it makes your cat urinate more. This can lead to the loss of fluids and minerals from your cat’s body.

Dehydration and electrolyte imbalance can also cause symptoms such as dry mouth, sunken eyes, weakness, lethargy, and collapse. These can worsen the effects of caffeine poisoning in cats, making it more difficult to treat.

9.    Cherries

Cherries contain cyanide, a chemical that prevents the cells from using oxygen, which is essential for life. When your cat eats cherries, the cyanide can enter their bloodstream and cause serious problems. It can affect your cat’s heart, lungs, brain, and other organs.

Some of the symptoms of cherry poisoning in cats are bright red gums; difficulty breathing; dilated pupils; shock; and even death.

The most dangerous parts of the cherry plant for your cat are the pits, stems, leaves, and blossoms. These parts contain cyanogenic glycosides, which are substances that turn into cyanide when broken down by chewing or digestion. Even a small amount of these parts can be fatal for your cat.

While the flesh of the cherry itself is not toxic to your cat, it is not a healthy food either. Cherries are high in sugar, which can cause obesity, diabetes, and dental problems. In addition, these fruits do not provide enough protein or taurine for your cat and can cause nutritional deficiencies if fed as their main diet.

10.  Chocolate

Chocolates contain a substance called theobromine, which is harmless to us, but toxic to cats and other animals. It can cause serious problems for your cat’s heart, nervous system, and digestive system.

Cats cannot break down theobromine as fast as humans, so it can build up in their body and cause poisoning. It can cause symptoms such as increased heart rate; irregular heartbeat; high blood pressure; muscle tremors; seizures; coma; and even death.

The amount of theobromine that can cause toxicity in cats depends on the type and amount of chocolate, as well as on their weight and health. Darker chocolates have more theobromine than lighter ones, so they are more dangerous. For example, one square of unsweetened baking chocolate is equally as toxic as 23 chocolate kisses to a 10-pound cat. In short, even a small amount of chocolate can be deadly to your cat.

Chocolates can also contain caffeine, which is another stimulant that can harm your cat. It is found in smaller amounts than theobromine in chocolates, but it can still cause adverse effects. It can cause symptoms such as vomiting, diarrhea, restlessness, hyperactivity, panting or rapid breathing, and difficulty swallowing. Caffeine can also worsen the effects of theobromine poisoning in cats, making it more difficult to treat.

Finally, chocolates can contain other ingredients that are unsafe for cats, such as sugar, artificial sweeteners, nuts, or spices. Sugar can cause obesity, diabetes, and dental problems, while artificial sweeteners, such as xylitol, can cause a severe drop in blood sugar, liver damage, seizures, and even death.

In addition, nuts can cause choking hazards or allergic reactions, while spices can irritate the mouth and digestive tract. Some chocolates may also have wrappers or sticks that can cause choking or intestinal obstruction in cats who swallow them.

11.  Cinnamon

Cinnamon contains coumarin, which cats cannot break down in their livers. It is a natural substance that protects the cinnamon plant from insects and fungi, but it can also cause blood-clotting problems (if ingested in large amounts) and liver damage. Cats are more sensitive to coumarin than humans, and even a small amount of cinnamon can have a big impact on their health.

Some cats may also be allergic to cinnamon and experience symptoms such as itching, swelling, and sneezing. It can also irritate their mouth, throat, and lungs, causing inflammation and difficulty breathing. In addition, it can affect their nervous system and cause symptoms such as muscle weakness and trembling.

12.  Citrus fruits (lemons, limes, oranges, grapefruit, etc.)

Citrus fruits are a refreshing and healthy snack for humans, but they can be very harmful for cats. Firstly, they are acidic, which can irritate your cat’s mouth, throat, and stomach. Cats have a sensitive digestive system and cannot tolerate acidic foods well. It can cause symptoms such as drooling, vomiting, diarrhea, abdominal pain, and loss of appetite.

Secondly, citrus fruits are high in limonoids, which are substances that affect the brain and the lungs. Cats cannot metabolize them as fast as humans, so they can accumulate in their body and cause poisoning. They can cause symptoms such as difficulty breathing, coughing, wheezing, sneezing, seizures, coma, and even death.

The amount of limonoids that can cause toxicity in cats depends on the type and amount of citrus fruit, as well as on their weight and health. For example, one lemon can contain up to 500 mg of limonoids, which is enough to kill a 10-pound cat. Even a small bite of citrus fruit can be dangerous for your cat.

Finally, citrus fruits can contain other ingredients that are unsafe for cats, such as sugar and pesticides. Sugar can cause obesity, diabetes, and dental problems, while pesticides can cause organ damage or cancer. Some citrus fruits may also have stickers or labels that can cause choking or intestinal obstruction in cats who swallow them.

13.  Cloves

Cloves are a fragrant spice that can add flavor and aroma to many dishes and drinks. However, they can also be very harmful for your cat if they eat them or inhale them. Cloves contain a chemical called eugenol, a substance that affects the liver, the stomach, and the nervous system of cats.

Cats cannot process eugenol as fast as humans, so it can build up in their body and cause poisoning, with symptoms such as vomiting, diarrhea, abdominal pain, lethargy, seizures, coma, and even death.

The amount of eugenol that can cause toxicity in cats depends on the form and amount of clove, as well as on their weight and health. For example, one teaspoon of clove powder can contain up to 1,500 mg of eugenol, which is enough to kill a 10-pound cat. Even a small amount of clove can be deadly for your cat.

Clove products, such as clove oil, clove cigarettes, or clove-scented candles, can also be toxic to cats. Clove oil is highly concentrated and can be absorbed through the skin or the mouth, making it more potent and harmful than whole or ground cloves.

On the other hand, clove cigarettes and candles can emit eugenol into the air, which can irritate your cat’s respiratory system and cause breathing difficulties. If your cat has asthma or allergies, they may be more sensitive to clove products.

14.  Coconut flesh and coconut water

Coconut flesh and coconut water contain a type of fat called medium-chain triglycerides (MCTs). It can be easily digested and absorbed by humans, but not by cats.

Cats have a different metabolism than humans and cannot process MCTs well. They can cause symptoms such as vomiting, diarrhea, abdominal pain, loss of appetite, lethargy, liver damage, fat accumulation in the liver, jaundice, and even death.

The amount of MCTs that can cause toxicity in cats depends on the form and amount of coconut, as well as on their weight and health. For example, one ounce of coconut flesh can contain up to 9 grams of MCTs, which is enough to kill a 10-pound cat. Even a small amount of coconut flesh or coconut water can be deadly to your cat.

In addition, coconut flesh and coconut water can cause dehydration and electrolyte imbalance. Coconut water is also high in potassium, which can affect your cat’s heart and kidney function. Additionally, it can cause a loss of sodium, which can lead to muscle weakness, confusion, or seizures.

15.  Currants

Currants are a type of small berry that is often used in jams, pies, or salads. They may look harmless, but they can be very dangerous for cats if they eat them.

The substance that causes toxicity in cats is unknown, but it is present in all parts of the currant plant, including the fruit, stems, leaves, and seeds.

When your cat eats currants, the substance can enter their bloodstream and affect their kidney function, causing symptoms such as vomiting; diarrhea; loss of appetite; lethargy; dehydration; increased thirst and urination; decreased or no urine production; blood in urine; abdominal pain; bad breath; oral ulcers; seizures; coma; and even death.

The amount of currants that can cause toxicity in cats is not known, but it is better to be safe than sorry. Therefore, it is advisable to keep currants and currant products away from your cat and to never feed them any part of the fruit or plant.

16.  Dog food

Dog food may seem like a convenient and cheap option for feeding your cat, but it can be very harmful for them. It is not designed to meet their nutritional needs, and it can cause serious health problems if fed to them on a regular basis.

Dog food is low in protein, taurine, and other essential nutrients for cats, which can cause nutritional deficiencies and diseases. Without enough protein and taurine, your cat can develop symptoms such as weakness, weight loss, poor coat quality, blindness, heart failure, and even death.

In addition, dog food is high in carbohydrates, which can cause obesity, diabetes, and digestive problems in cats. It contains too much starch, sugar, and fiber, which can cause symptoms such as vomiting, diarrhea, gas, bloating, constipation, obesity, diabetes, and inflammation.

17.  Eggplant

Eggplants contain solanine, a substance that protects it from insects and fungi but that can also affect your cat’s stomach, liver, and nervous system. When your cat eats eggplants, the solanine can enter their bloodstream and cause symptoms such as vomiting, diarrhea, abdominal pain, loss of appetite, lethargy, seizures, coma, and even death.

The amount of solanine that can cause toxicity in cats depends on the type and amount of eggplant, as well as on their weight and health. Raw eggplants are more dangerous than cooked ones, as cooking reduces the solanine content. Moreover, the peel, seeds, leaves, and stems of this vegetable have more solanine than the flesh. Even a small amount can be harmful for your cat.

In addition, eggplants do not provide enough protein or taurine for cats and can cause nutritional deficiencies if fed as their main diet.

18.  Fat trimmings from meat

Fat trimmings can cause gastrointestinal upset in cats, such as vomiting and diarrhea. This is because cats have a sensitive digestive system and cannot tolerate too much fat in their diet. Fat can also interfere with the absorption of other nutrients and cause malnutrition.

In addition, fat trimmings can cause pancreatitis, which is a painful and potentially fatal condition. When your cat eats fat trimmings, the pancreas can become overstimulated and produce too many enzymes, which can damage the pancreas itself and other organs. It can cause symptoms such as loss of appetite, fever, dehydration, abdominal pain, hunched posture, weakness, jaundice, shock, and even death.

Pancreatitis can be acute or chronic, and it can require intensive treatment and hospitalization. It can also lead to complications such as diabetes, liver failure, or infection.

Additionally, fat trimmings can pose a choking hazard or an intestinal obstruction for your cat. If your kitty swallows a large piece of fat or a bone, they can choke on it or have it stuck in their throat or stomach, causing difficulty breathing, gagging, coughing, or vomiting.

If the fat or bone passes through the stomach, it can cause a blockage in the intestines, which can prevent the passage of food and waste. This can cause symptoms such as constipation, straining to defecate, abdominal swelling, vomiting, lethargy, loss of appetite, dehydration, peritonitis, and even death.

19.  Grapes and raisins

Grapes and raisins contain a substance that can damage the kidneys of cats and cause acute kidney failure. Although the specific substance that causes toxicity is unknown, it is present in all parts of the grape plant, including the fruit, stems, leaves, and seeds.

When your cat eats grapes or raisins, the substance can enter their bloodstream and affect their kidney function. When the kidneys are damaged, your cat can develop symptoms such as vomiting, diarrhea, loss of appetite, lethargy, dehydration, increased thirst and urination, decreased or no urine production, blood in urine, abdominal pain, bad breath, oral ulcers, seizures, coma, and even death.

There is no safe dose of grapes or raisins for cats, and some kitties may be more sensitive than others. Even a small amount of grapes or raisins can be deadly to your feline friend.

20.  Gravy (especially gravy made with onions or garlic)

One of the main dangers of gravy for cats is the seasonings that are added to it. Many gravies contain onions, garlic, or chives, which can damage their red blood cells, causing a condition called Heinz body anemia. This can, in turn, lead to weakness, breathing difficulties, and even death.

Another problem with gravy for cats is the high fat content, which can cause vomiting, diarrhea, and stomach pain. Fat can also lead to obesity, diabetes, and pancreatitis in the long run.

The amount of fat that can cause feline toxicity depends on the type and amount of gravy, as well as on your cat’s weight and health. For example, one teaspoon of gravy can contain up to 5 grams of fat, which is enough to cause pancreatitis in a 10-pound cat. Even a small amount can be deadly to your kitty.

Finally, gravy can contain other ingredients that are unsafe for cats, such as sugar and artificial sweeteners. Sugar can cause obesity, diabetes, and dental problems, while artificial sweeteners, such as xylitol, can cause a severe drop in blood sugar, liver damage, seizures, and even death.

21.  Herbs

One of the main dangers of herbs for cats is the toxicity of some species. There are many types of herbs that contain substances that can harm the digestive system, nervous system, blood cells, or organs of cats. Some of the most common and harmful herbs for them are:

Mint: Mint is a family of herbs that includes peppermint, spearmint, catnip, and pennyroyal. Mint can cause vomiting, diarrhea, abdominal pain, and liver damage. Catnip is an exception, as it is not toxic to cats, but it can cause behavioral changes and overstimulation.

RELATED: Understanding Cat Behaviors: 140 Cat Behaviors Explained

•  Lavender: Lavender can cause vomiting, diarrhea, and skin irritation in cats. It can also affect the nervous system and cause depression, sedation, or seizures.

•  Marijuana: Marijuana can cause vomiting, diarrhea, low blood pressure, a low heart rate, dilated pupils, drooling, tremors, seizures, coma, and even death in cats.

•  Oregano and Marjoram: Oregano and marjoram can cause vomiting, diarrhea, and skin irritation in cats. They can also affect the nervous system and cause depression, sedation, or seizures.

Another problem with herbs for cats is the difficulty of identification. There are thousands of herb species, and many of them look similar or have different names. It can be very hard to tell which herbs are safe and which are not, even for experts.

If you are not sure what kind of herb your cat has eaten, you should assume that it is poisonous and seek veterinary help immediately. You should also try to collect a sample of the herb or take a picture of it for identification purposes.

The amount of herb that can cause toxicity in cats depends on the species and the amount ingested by your cat. Some herbs can be toxic for cats, even in small amounts, so, with the exception of catnip, it’s best to keep them away from all herbs in general.

22.  Hop-infused products

Hops are a plant that is used in the process of brewing beer. They have a bitter flavor and a floral aroma that can enhance the taste and quality of the drink. However, they are toxic to cats and can cause a serious condition called malignant hyperthermia.

Malignant hyperthermia is a rare but life-threatening reaction that occurs when your cat’s body temperature rises rapidly and uncontrollably. It can affect your cat’s heart, lungs, brain, and other organs. When your cat eats hops, a chemical in the plant can trigger this reaction and cause symptoms such as panting, high body temperature (above 105°F/40.6°C), seizures, coma, and even death.

The amount of hops that can cause toxicity in cats is not known, but it is better to be safe than sorry. Therefore, it is advisable to keep hops and hops products away from your cat and to never feed them any part of the plant or the drink.

Aside from beer, below are some of the products that contain hops:

  • Hoppy Refresher
  • HopTea
  • Hop Water
  • Hop Soda
  • Hi-Fi Hops
  • Hop Salt
  • Hop Honey
  • Hop Cheese
  • Hop Bread
  • Hop Cookies

23.  Horseradish

Horseradish contains a chemical called allyl isothiocyanate, which is responsible for its pungent odor and flavor. This chemical can irritate your cat’s mouth, throat, and stomach and cause symptoms such as drooling, vomiting, diarrhea, abdominal pain, and loss of appetite.

Allyl isothiocyanate can also affect your cat’s respiratory system, especially if they inhale the vapors from horseradish. This can cause symptoms such as sneezing, coughing, wheezing, and difficulty breathing.

Additionally, when the horseradish comes into contact with a cat’s skin, it can cause redness, itching, and burning. Allyl isothiocyanate can irritate delicate skin tissue, leading to discomfort and potential inflammation.

The amount of allyl isothiocyanate that can cause toxicity in cats is not known, but it is better to be safe than sorry. Therefore, it is advisable to keep horseradish and horseradish products away from your cat and to never feed them any part of the plant.

24.  Ice cream (especially ice cream that contains chocolate or macadamia nuts)

One of the main dangers of ice cream for cats is the dairy content. Most felines are lactose intolerant, which means they cannot digest the sugar in milk. When they eat ice cream, the lactose can cause symptoms such as vomiting, diarrhea, abdominal pain, gas, and bloating.

Lactose intolerance can also lead to dehydration and electrolyte imbalance, which can affect their heart and kidney function.

Another problem with ice cream for cats is the sugar content. Sugar can cause obesity, diabetes, and dental problems in cats. It can also cause changes in their gut bacteria, which can affect their immune system and digestion.

Some ice creams can also contain ingredients that are toxic or harmful for cats, such as chocolate, xylitol, nuts, or spices. Some of these ingredients can be fatal for them, even in small amounts.

25.  Liver (including Liverwurst)

Liver can be very harmful for cats if they eat too much of it, especially if it is from a large animal like a cow or sheep.

One of the main dangers of liver for cats is vitamin A toxicity. Although cats cannot produce vitamin A on their own and need to get it from their diet, too much of it can affect their bones, skin, and internal organs. It can cause symptoms such as lethargy; weight loss; skin problems in the neck and front limbs; constipation; dull coat; malformation of the bones (can be seen as painful movements and abnormalities in posture); and even death.

The amount of vitamin A that can cause toxicity in cats depends on the type and amount of liver, as well as on their weight and health. For example, one ounce of beef liver can contain up to 12,000 IU of vitamin A, which is enough to kill a 10-pound cat. Even a small amount can be deadly to your feline baby.

Another problem with liver for cats is its high iron content. Iron is an essential mineral that helps your cat’s blood carry oxygen, but too much of it can be toxic for your cat and cause damage to their liver and other organs. Iron toxicity can cause symptoms such as vomiting, diarrhea, abdominal pain, loss of appetite; lethargy; jaundice; seizures; coma; and even death.

The amount of iron that can cause toxicity in cats depends on the type and amount of liver, as well as on their weight and health. For example, one ounce of beef liver can contain up to 5 mg of iron, which is enough to cause iron poisoning in a 10-pound cat.

26.  Milk and other dairy products

Milk and other dairy products contain a type of sugar called lactose, which many cats have trouble digesting. Lactose intolerance is the inability to break down lactose in the digestive system due to the lack of an enzyme called lactase.

Lactose intolerance can cause symptoms such as vomiting, diarrhea, abdominal pain, gas, and bloating. It can also lead to dehydration and electrolyte imbalance, which can affect heart and kidney function.

This condition is very common in cats, especially as they grow older and produce less lactase. Some may be more sensitive than others, and even a small amount of milk or dairy products can cause problems for them.

Some milk and dairy products may also contain ingredients that are toxic or harmful for cats, such as chocolate, xylitol, or spices. These can be fatal for them, even in small amounts.

27.  Mushrooms

One of the main dangers of mushrooms for cats is the toxicity of some species. There are many types of mushrooms that contain substances that can damage the kidneys, liver, nervous system, or blood cells of cats. Some of the most common and deadly types are:

•  Amanita mushrooms, such as the death cap, the destroying angel, the fly agaric, and the panther cap. These mushrooms contain amanitin, a toxin that causes liver failure and even death. They also contain muscarine, isoxazole, and psilocybin, which can cause vomiting, diarrhea, salivation, breathing problems, seizures, and hallucinations.

•  Galerina and Lepiota mushrooms, which also contain amanitin and can cause the same symptoms as Amanita mushrooms

•  Inocybe and Clitocybe mushrooms, which contain muscarine and can cause vomiting, diarrhea, salivation, a low heart rate, and low blood pressure.

•  Psilocybe mushrooms, also known as magic mushrooms, which contain psilocybin and can cause hallucinations, fever, and agitation.

Another problem with mushrooms is their difficulty of identification. There are thousands of species, and many of them look similar or have different names. It can be very hard to tell which ones are safe and which are not, even for experts.

If you are not sure what kind of mushroom your cat has eaten, you should assume that it is poisonous and seek veterinary help immediately. You should also try to collect a sample of the mushroom or take a picture of it for identification purposes.

The amount of mushrooms that can cause toxicity in cats depends on the species and the amount of mushrooms they ingested. But if it were me, I’d err on the side of caution and not feed my cat any type of mushroom at all.

28.  Mustard seeds

Mustard seeds can cause severe gastroenteritis in cats, a condition that involves the inflammation of the stomach and intestines. They contain a chemical called allyl isothiocyanate, which is responsible for their pungent flavor and aroma but can irritate your cat’s mouth, throat, and digestive tract and cause symptoms such as drooling, vomiting, diarrhea, abdominal pain, and loss of appetite.

Gastroenteritis can also lead to dehydration and electrolyte imbalance, which can affect your cat’s heart and kidney function. It can be fatal for cats if not treated promptly.

The amount of mustard seeds that can cause toxicity in cats depends on the type and amount of seeds, as well as on their weight and health. There is no safe dose of mustard seeds for felines, and some may be more sensitive than others. Even a small amount can be harmful for them.

29.  Nutmeg

Nutmeg contains a chemical called myristicin, which is a natural insecticide and hallucinogen. It can cause liver failure and even death in cats. Cats cannot process myristicin as fast as humans, so it can build up in their body and cause poisoning, resulting in symptoms such as vomiting, diarrhea, abdominal pain, lethargy, seizures, coma, and even death.

Myristicin can also cause hallucinations, disorientation, and agitation. It is a psychoactive substance that can affect the brain and the body. It can cause symptoms such as fever, dilated pupils, drooling, tremors, vocalization, confusion, and aggression.

These symptoms can last up to 48 hours and can be very distressing for you and your kitty. Your cat may not recognize you or their surroundings and may act erratically or violently.

The amount of myristicin that can cause toxicity in cats depends on the type and amount of nutmeg, as well as on their weight and health. For example, one teaspoon of nutmeg can contain up to 1,500 mg of myristicin, which is enough to kill a 10-pound cat.

30.  Nuts & Nut Oils

Nuts are high in fat, which can cause problems for cats who have a low tolerance for fatty foods. Too much fat in the diet can lead to obesity, diabetes, and pancreatitis, a painful inflammation of the pancreas. Nuts also contain a lot of calories, which can contribute to weight gain and overeating.

Some nuts, such as macadamia nuts, are especially toxic to cats and can cause vomiting, tremors, weakness, and paralysis.

Nut oils are derived from nuts and can have similar effects. However, nut oils can also pose another risk: they can contain essential oils that are harmful to cats. These essential oils contain compounds such as terpenes, ketones, and phenols, which can damage the liver, kidneys, nervous system, and respiratory system.

Some of the symptoms of essential oil poisoning include drooling, vomiting, difficulty breathing, seizures, coma, and even death.

The types of nuts that are toxic to cats are macadamia nuts and black walnuts. These can cause vomiting, tremors, weakness, paralysis, and liver damage.

Other nuts, such as almonds, pecans, walnuts, cashews, pistachios, and hickory nuts, are not toxic to cats, but they can still cause problems such as stomach upset, diarrhea, pancreatitis, and choking because they are high in fat, oil, and calories, which are not suitable for their digestion and metabolism. As such, it is best to avoid giving any nuts or nut products to your cat.

  • Onions, garlic, leeks, chives, and shallots (including onion and garlic powder)

These herbs belong to the plant group called alliums, which are toxic to cats and dogs. Alliums contain chemicals called disulfides and thiosulfinates, which can damage your cat’s red blood cells and cause anemia. This can make your cat feel weak, tired, and sick.

The symptoms of allium poisoning in cats can vary depending on how much and what type of allium they ate. Some of the common signs are vomiting, diarrhea, loss of appetite, stomach pain, pale or yellow gums, trouble breathing, and a fast heart rate.

32.  Peaches

Peaches are part of the rose family, along with plums, apricots, and cherries. These plants have parts that are poisonous to cats and other animals, such as the stems, leaves, and seeds (also called pits or kernels). They contain a chemical called amygdalin, which releases cyanide when your cat eats or chews on them.

Cyanide is a very toxic substance that can interfere with your cat’s ability to use oxygen, making your feline baby suffer from serious symptoms such as difficulty breathing, bright red gums, dilated pupils, tremors, seizures, coma, and even death. The symptoms can appear within a few hours or a few days after eating peaches or peach parts.

The amount of cyanide in peaches varies depending on the type and condition of the plant. Wilting peach leaves are especially dangerous, as they have more cyanide than fresh ones. Peach pits are also very risky, as they can cause choking or intestinal blockage if your cat swallows them whole or in pieces.

Some people may use peach pits or kernels to make oils or home remedies, but these products can also be harmful to your cat if they are ingested or absorbed through the skin.

Although the flesh of peaches is not poisonous to cats, it is not recommended to feed them to your cat either. They are high in sugar and calories, which can cause obesity, diabetes, and dental problems. These fruits also contain a lot of fiber, which can upset your cat’s stomach and cause diarrhea or vomiting.

33.  Persimmons

Persimmons contain a high amount of tannins, which can cause stomach upset, vomiting, diarrhea, and constipation in cats. They can also affect the absorption of iron and other minerals, leading to anemia and other deficiencies.

In addition, these fruits have a high sugar content, which can be harmful to cats who are prone to diabetes and obesity. Sugar can raise their blood glucose levels and insulin requirements, which can result in complications such as kidney damage, nerve damage, and blindness.

Another danger of persimmons for cats is the risk of choking or intestinal obstruction. These fruits have large seeds or pits that can get stuck in your cat’s throat or intestines, causing difficulty breathing, pain, and infection. The seeds also contain cyanide, which is a deadly poison that can cause respiratory failure, seizures, coma, and even death.

34.  Potatoes (raw), potato peelings and sprouts

Raw potatoes, potato peelings, and sprouts are toxic to cats because they contain a substance called solanine, which is a natural poison that protects the potato plant from pests and diseases. It can cause gastrointestinal, neurological, and cardiovascular problems, as well as symptoms such as vomiting, diarrhea, lethargy, difficulty breathing, tremors, seizures, and even death.

Other symptoms of solanine poisoning include drooling, vomiting, diarrhea, abdominal pain, fever, coughing, gagging, excessive urination, an uncoordinated gait, abnormal eye movements, different-sized pupils, abnormal heart rhythm, muscle tremors, convulsions, and coma.

Although cooked potatoes are safe for your cats, you should still avoid feeding these vegetables to them, as they are high in carbohydrates and the solanine is not completely eliminated.

35.  Processed meats

Processed meats contain high levels of salt, preservatives, and artificial additives that are not suitable for feline consumption. Salt can cause dehydration, kidney damage, and high blood pressure, while preservatives and artificial additives can cause allergic reactions, digestive problems, and cancer.

Processed meats also lack the essential nutrients that cats need, such as taurine, which is vital for their heart and eye health.

Some of the common types of processed meats that are harmful to cats are hot dogs, bacon, ham, sausages, Spam, deli meats, beef jerky, canned meats, and smoked meats. These foods are not only high in salt but also in fat, which can lead to obesity, diabetes, and pancreatitis.

Some processed meats may also contain spices and flavorings that could be toxic to cats, such as garlic, onion, pepper, and nutmeg.

36.  Raw eggs, meat, and fish

Raw eggs, meat, and fish may contain harmful bacteria like Salmonella or E. coli, leading to food poisoning in cats and resulting in symptoms like vomiting, diarrhea, and lethargy. Additionally, raw eggs contain avidin, which reduces biotin absorption, which is vital for your cat’s skin and coat health.

Raw meat also carries the risk of other bacteria like listeria, clostridium, and campylobacter, which can cause similar symptoms and harm your cat’s liver, kidneys, and nervous system. In addition, it can harbor parasites, including toxoplasmosis, trichinosis, and tapeworms, which can infect your cat’s intestines and other organs, leading to weight loss, anemia, fever, coughing, and seizures.

On the other hand, raw fish also contains thiaminase, which destroys thiamine, an essential B vitamin for your cat’s neurological function and metabolism, resulting in serious neurological problems, convulsions, and coma.

37.  Spicy foods

Spicy foods contain a substance called capsaicin, which can cause gastrointestinal and digestive problems such as upset stomachs, diarrhea, and vomiting. It is a chemical that gives spicy foods their heat and flavor, but it can also irritate and inflame your cat’s mouth, throat, and stomach.

In addition, spicy foods can lead to a runny nose and watery eyes, as capsaicin can trigger the release of histamine, a chemical that causes allergic reactions. Histamine can cause sneezing, coughing, itching, and swelling. Moreover, spicy foods can cause bronchoconstriction, which is a narrowing of the airways that makes breathing difficult.

38.  Spoiled or moldy food

Spoiled or moldy food can contain bacteria such as Salmonella or E. coli, which can cause food poisoning in cats and lead to vomiting, diarrhea, and lethargy.

Putrid food can also contain fungi such as penicillium, which can produce toxins called mycotoxins.  These can damage your cat’s liver, kidneys, nervous system, and blood cells. They can also cause allergic reactions, digestive problems, and cancer.

In addition, spoiled or moldy food can contain parasites such as toxoplasmosis, trichinosis, and tapeworms, which can infect your cat’s intestines and other organs. These parasites can cause weight loss, anemia, fever, coughing, and seizures.

39.  Star Anise

Star anise contains a compound called anethole, which can cause liver damage, seizures, and even death if ingested in large amounts. This spice can also affect your cat’s nervous system and cause symptoms such as muscle weakness and trembling. It can interfere with your cat’s neurotransmitters, which are chemicals that carry messages between the brain and the body.

Additionally, some cats may be allergic to it and experience symptoms such as itching, swelling, and sneezing. Moreover, it can irritate your cat’s mouth, throat, and lungs, causing inflammation and difficulty breathing.

40.  Sweets and Xylitol

Foods such as candy, cake, and honey contain a lot of sugar, causing obesity, diabetes, and dental problems in cats.

Xylitol, on the other hand, is a sugar substitute that is commonly used in sugar-free gum, candy, and other products. It can cause a rapid drop in blood sugar, liver damage, seizures, and even death. It can also trigger the release of insulin, a hormone that regulates blood sugar levels, in turn causing hypoglycemia, a condition where the blood sugar is too low and leads to weakness, confusion, tremors, seizures, and coma.

Xylitol can also damage the liver cells, which can cause liver failure, bleeding, and jaundice in cats.

41.  Tomatoes

Tomatoes contain a substance called solanine, which can cause gastrointestinal and digestive problems such as upset stomachs, diarrhea, and vomiting.

Solanine is a chemical that gives tomatoes their color and flavor, but it can also irritate and inflame the mouth, throat, and stomach of your cat. It is found in the green parts of the tomato plant, such as the stems, leaves, and flowers, as well as in the skin and flesh of unripe or raw tomatoes.

Ripe tomatoes have less solanine, but they are still not recommended for cats, as they can also cause allergic reactions, respiratory problems, and weight gain. Moreover, they are high in sugar and calories, which can lead to obesity, diabetes, and dental problems.

42.  Tuna (canned)

Although canned tuna is safe for cats in small amounts, giving them a lot of it can be dangerous for them because it can contain high levels of mercury, salt, and fat that are not suitable for feline consumption.

Mercury is a heavy metal that can accumulate in the body and cause damage to the nervous system, kidneys, and liver. Feeding your cat lots of tuna may cause mercury poisoning with muscle weakness, trembling, and even seizures.

Salt, on the other hand, is a mineral that can cause dehydration, kidney damage, and high blood pressure. Canned tuna (in brine) is very high in sodium (salt) and can cause excessive thirst, urination, and swelling in cats.

As for fat, too much of it can cause obesity, diabetes, and pancreatitis. In this regard, canned tuna (in oil) is very high in fat and can cause weight gain, overeating, and inflammation of the pancreas.

Canned tuna is also low in some nutrients that cats need, such as taurine, vitamin E, and antioxidants. A lack of these nutrients can cause heart disease, vision loss, and steatitis (yellow fat disease).

43.  Yeast dough

Yeast can cause two serious problems in cats: bloat and alcohol poisoning.

It is a mixture of flour, water, sugar, and yeast that is used to make bread and other baked goods. When it is left to rise, the yeast ferments the sugar and produces carbon dioxide and ethanol.

If your cat eats yeast dough, the dough will continue to rise and ferment inside their stomach. This can cause bloat, a condition where the stomach becomes swollen and painful. It can interfere with your cat’s breathing and blood circulation and even cause their stomach to rupture.

The ethanol produced by the yeast can also be absorbed into the cat’s bloodstream and cause alcohol poisoning, which can affect the cat’s nervous system and cause symptoms such as vomiting, diarrhea, lethargy, difficulty breathing, tremors, seizures, coma, and even death.

Some products that contain yeast dough include bread, pizza, and pastries.

What to do if you think your cat has eaten something toxic

If you think your cat has eaten something toxic, you should act quickly and follow these steps:

•  Remove any remaining toxic substances from your cat’s mouth or environment. If possible, identify the substance and estimate how much your cat has eaten.

•  Call your veterinarian or a pet poison helpline immediately and provide them with information about the substance, the amount, the time of ingestion, and your cat’s symptoms. Do not try to induce vomiting or give any home remedies to your cat unless instructed to do so by a professional.

•  Follow the instructions given by your veterinarian or the pet poison helpline. They may ask you to bring your cat to the clinic or to monitor your cat at home. They may also prescribe some medication or treatment for your cat.

•  Keep your cat comfortable and calm. Watch for any changes in your kitty’s behavior, breathing, heart rate, or temperature. If their condition worsens, contact your veterinarian or the pet poison helpline again.

How to Protect Your Cat from Toxic Foods

Keep the following in mind to protect your cat from foods that are dangerous to them:

  • Keep the toxic food away from your cat. This includes raw, cooked, dried, powdered, or liquid forms of the food.
  • If you use any products that contain toxic food items, such as sauces, cosmetics, or essential oils, make sure to store them in a safe place and wash your hands and utensils before touching your cat or their food.
  • Make sure your cat can’t access the trash or any leftovers that may have toxic food in them.
  • Dispose of the pits of toxic fruits properly. Do not leave them lying around the house or in the trash.
  • If you use the food item in your cooking, make sure to wash your hands and utensils before handling your cat or their food.
  • If you have a toxic fruit tree in your garden, make sure to fence it off or prune it regularly to prevent your cat from accessing it.

Final Thoughts

Be careful about what you feed your cat. Don’t feed them something just because it’s funny or amusing. Our fur babies have very short lives, so keeping them healthy in every way possible will help them live longer.

Consider not only the food products you give them but also the ingredients used to make them. Although the main product might be safe for your cat, if it contains ingredients that might be harmful to them, then please think of something else to give them.

By keeping your cat safe from all toxic food and giving them a healthy and well-balanced diet, you’ll be able to extend the years you and your cat will enjoy each other.

RELATED: Ultimate First-Time Cat Owner Guide: Everything You Need to Know About Raising a Cat

Frequently Asked Questions

What human foods are deadly to cats?

Some human foods that are deadly to cats include chocolate, grapes, raisins, onions, garlic, chives, macadamia nuts, xylitol (a sweetener found in some sugar-free products), and yeast dough.

Why is chocolate deadly to cats?

Chocolate contains theobromine and caffeine, both of which are toxic to cats. Theobromine can cause vomiting, diarrhea, hyperactivity, tremors, seizures, and even death in cats.

Why are grapes and raisins deadly to cats?

Grapes and raisins can cause kidney failure in cats. The exact mechanism of toxicity is unknown, but it is thought to be related to a substance called tartaric acid.

Why are onions, garlic, and chives deadly to cats?

Onions, garlic, and chives contain compounds that can damage a cat’s red blood cells and lead to anemia. In severe cases, anemia can be fatal.

Why are macadamia nuts deadly to cats?

Macadamia nuts can cause muscle weakness, tremors, and vomiting in cats. The exact mechanism of toxicity is unknown, but it is thought to be related to a fatty acid found in the nuts.

Why is xylitol deadly to cats?

Xylitol is a sweetener found in some sugar-free products, such as gum, candy, and mints. It can cause a rapid drop in blood sugar in cats, which can lead to seizures, coma, and even death.

Why is yeast dough deadly to cats?

When yeast dough is eaten by cats, it ferments in their stomachs and produces alcohol and carbon dioxide. This can cause alcohol poisoning, bloating, and gastrointestinal obstruction.

What should I do if I think my cat has eaten something poisonous?

If you think your cat has eaten something poisonous, it is important to contact your veterinarian immediately. The veterinarian can induce vomiting to remove the toxin from the cat’s stomach and provide other supportive care as needed.

How can I prevent my cat from eating poisonous foods?

The best way to prevent your cat from eating poisonous foods is to keep all potential toxins out of reach. This includes human foods, cleaning products, and medications. You should also supervise your cat closely when they are outdoors.

What are some safe and healthy treats that I can give my cat?

Some safe and healthy treats that you can give your cat include cooked chicken, fish, lean beef, and small amounts of catnip. You can also purchase commercial cat treats that are designed to be safe and nutritious.

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