Why Is My Cat Not Eating? Causes, Symptoms and Treatment · The Wildest

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Why Is My New Cat Not Eating?

A veterinary nutritionist explains the causes, signs and treatment for how to increase their appetite

by Kate Sheofsky
Updated 30 October 2023
Profile view of a man giving a cat food to eat
Studio Firma / Stocksy

Is there anything you wouldn’t do to make yourself worthy of your cat’s affection? You scoop poop from their litter box. You let them sleep on your face. You tolerate 2am zoomies. And, of course, you try to feed them the very best food. Feeding is an act of love. But, contrary to how it sometimes feels, not eating isn’t necessarily an act of defiance.

What are the causes of cats not eating?

There are several possible reasons for a cat not eating as much. Cat loss of appetite can be caused by food preferences; they may prefer a new food or food topping. A new cat not eating may be because of stress and trouble acclimating to a new space. Illness could also be the reason why your cat won’t eat. It’s important to see a vet to rule out any underlying illness like cancer, pancreatitis or intestinal problems. Dental problems and oral pain could also cause a cat to stop eating.

How long can a cat go without eating?

Technically, a healthy cat can live for up to two weeks without food and only three days without water – similarly to humans. That said, a cat hunger strike should be nipped in the bud early, because cats can become extremely weak within days of not eating. After three days of a cat not eating food, serious medical side effects can occur.

How can you help a cat who won’t eat?

Thankfully, there are many ways to encourage a cat to eat more. We turned to BluePearl Pet Hospital’s board-certified veterinary nutritionist Dr Lindsey Bullen to break them down for us.

1. Let your new cat get acclimatised

If you’ve just brought a new cat or kitten home, there’s a good chance that they’re nervous and stressed. “A new cat may go into hiding when you first bring them home,” says Dr Bullen. “At that moment, they are far more concerned with feeling safe than eating dinner.” Your new cat may also be hesitant to try a different food.

In a perfect world, you’d be able to transition them from their old diet to a new one over several days. But you may not know what your cat was previously being fed (or if they were fed ‘cat food at all, if they were a stray). Change is hard, especially for cats. In both of these cases, they may need a little time to get acclimatised to their new home and food before they settle into an eating routine. 

2. Schedule mealtimes to keep tabs on their eating habits

Underlying health issues are another reason for a cat loss of appetite. Unfortunately, cats are notoriously good at hiding when they don’t feel well, and that can make it hard to tell if there are changes to their eating habits. “I recommend giving cats set meals instead of free-feeding,” says Dr Bullen. “Especially in a multi-cat household, it’s very difficult to tell how much each cat is eating when there’s just a bowl of food left out all the time.

“Meal feeding makes it easier to see who’s coming to the food dish and how much they’re eating. I also recommend weighing your cat once or twice a month. Subtle changes in weight can be hard to see, particularly in long-haired cats. Regularly weighing them will help you detect changes and take action quicker.”

3. Introduce kittens to various foods early on

Cats also have a reputation for being finicky eaters. Every cat is different, of course, but some certainly do have strong opinions about what they will (and won’t) eat. And we often chalk that up to part of their lovably maddening mystique. If you have a kitten, however, there are ways you can try to head off any picky tendencies. “It’s best to introduce cats to multiple kinds of foods when they’re young,” says Dr Bullen.

“As carnivores, they will develop a preference for flavour and form, and it’s harder to get them to change later in life. So, while I don’t recommend rotational feeding forever, offering them canned food, kibble, chicken and fish when they’re kittens can be helpful in preventing finicky habits in the future.”

4. Add cat food toppers to make meals more mouthwatering

For adult cats, in addition to trying out different complete diets, there are steps you can take to make their food more interesting. “Warming up canned food will release flavours and aromas,” says Dr Bullen. “You can accomplish the same effect with dry food by mixing in a little warm water.” There are also plenty of healthy foods you can add to their main diet.

Unseasoned puréed meats, cottage cheese, baby food, commercial food toppers and cat supplements are all great options. Dr Bullen’s go-to recommendation is FortiFlora Probiotic Supplement. “It’s made from hydrolysed animal digest and the majority of my patients love the flavour.”

5. Try different feeding set-ups

Some cats like to eat off a plate on the counter, while others prefer a bowl on the floor. When choosing a dish, Dr Bullen suggests avoiding metal or plastic, as both can alter the flavour or smell of the food. The right bowl can also prevent whisker fatigue.

When should I be concerned and seek veterinary help?

You can see your vet to rule out health issues like cat anorexia. It can be frustrating to work through a food-related issue with your cat. But it’s important to understand that cat anorexia is a serious health concern that can spiral quickly. “When a pet’s GI tract doesn’t get appropriate nutrients for about three days, the next generation of cells can’t function normally,” says Dr Bullen. “Ultimately, anorexia is another word for self-cannibalism, and that’s not conducive to life.”

So, when does not eating warrant a trip to the vet? “If your adult cat goes two to three days without eating, it’s time to see a veterinarian. And if their loss of appetite coincides with vomiting, diarrhoea, lethargy, or changes in behaviour, then they need to be seen even sooner – in 24–36 hours.” For kittens, the timeline is shorter still: “Kittens need to eat multiple meals a day. They should see a vet if it’s been more than 24 hours without eating.”

What foods can I tempt my cat to eat with?

There are several great meal treats for cats. Foods with very strong scents, such as tuna or sardines, may get the attention of a cat who won’t eat. Cats are also more likely to eat food that has been warmed up.

You may also want to add a meal topper to your cat’s meal. Things like chicken broth, gravy and sushi flakes may motivate your cat to finish their meal.

Frequently asked questions

Can stress cause a cat to stop eating?

Yes, stress is a common reason for a cat not eating as much. Make sure your cat has a space to themselves where they can feel safe during mealtime.

Why is my cat suddenly lethargic and not eating?

There are potential several reasons a cat won’t eat, including stress, food preferences and illness. See your vet to rule out any underlying health issues.

Why is my cat not eating and throwing up?

A cat who is not eating and throwing up should be seen by a veterinarian to rule out any potential issues including pancreatitis, cancer and infections.


Kate Sheofsky

Kate Sheofsky hails from San Francisco, where she developed a love of writing, Giants baseball, and houses she can’t afford. She currently lives in Portland, OR, and works as a freelance writer and content strategist. When not typing away on her laptop, she enjoys tooling around the city with her two rescue pups searching for tasty food and sunny patios.

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