Cat Care · Nutrition

The Best Cat Food For Weight Loss

What my parents’ cat Lillian taught me about wet food, meal feeding and keeping a cat at a healthy weight.

By Sarah Updated 5 min read

Cat eating raw meat from a bowl

Quick answer

For many overweight cats, the best food for weight loss is a measured amount of canned (wet) food fed as meals instead of a bowl of dry food left out all day. The vets at the Cornell Feline Health Center say canned food usually has more protein and fewer carbohydrates than kibble, and free-feeding dry food is a major cause of feline obesity. Always plan weight loss with your veterinarian. Losing weight too fast can be dangerous for cats.

I had the pleasure of some snuggle time with my parents’ cat Lillian this morning. She’s fit and healthy, which is somewhat of an anomaly: the trim domestic feline is almost mythical. So what’s her secret?

Talk to your vet first. This article is general information, not veterinary advice. Your vet can tell you your cat’s ideal weight and how many calories to feed.

A true story

Lillian’s story

Lillian goes outside, which I don’t recommend (my own cats are strictly indoor), so she gets plenty of exercise. But exercise isn’t everything when it comes to keeping fit. The key is diet.

Lillian doesn’t eat a prescription diet, and she doesn’t eat any dry cat food. When I looked in her food cabinet, I found good ole canned Fancy Feast.

About a year before I first wrote this, my parents switched her to a wet-food-only diet, after a lot of begging on my part. What finally convinced my father was catinfo.org, a site on feline nutrition by veterinarian Lisa A. Pierson, DVM. After a few months, they noticed Lillian had lost a lot of weight. They brought her to the vet fearing the worst, but her exam and blood work came back healthy. She was also much friendlier than I remembered.

Tortoiseshell cat lying down and looking at the camera

Nutrition

Why wet food helps

Cats are carnivores that evolved to eat animal protein. Dry food is often left out all day, and that’s where weight gain often starts. Here’s what the Cornell Feline Health Center says:

  1. Free feeding is a major factor. A bowl of dry food available all day is one of the main causes of feline obesity.
  2. Canned food usually has more protein and fewer carbs than kibble, and its high water content increases your cat’s fluid intake.
  3. Feed meals, not a full bowl. Canned food makes it easier to feed measured meals instead of letting a cat graze.

A good habit for any food: read the label and look at the first few ingredients. Under FDA rules, pet food ingredients are listed in descending order by weight, so the first ones make up the most of the food. Look for named animal proteins like chicken or fish at the top of the list. If you’re comparing low-calorie pâtés or other canned foods, check the calories per can on the label, too.

Fancy Feast

Is Fancy Feast good for cats?

Fancy Feast may be inexpensive grocery store cat food, but for Lillian, the classic canned pâté worked. According to Purina’s product label, the first five ingredients in Fancy Feast Classic Chicken Feast are chicken, chicken broth, meat by-products, liver and fish. The label says it’s formulated to meet AAFCO nutrient profiles for all life stages, and each can has 91 calories.

We can debate pet food brands until the cows come home. Whatever food you choose, a complete and balanced wet food fed in measured meals can be a small, easy and affordable change for weight management. Ask your vet which food and portion are right for your cat, especially if your cat has a medical condition.

Black cat with green eyes looking at the camera

Safety first

How to help your cat lose weight safely

  • Work with your vet: Cornell’s vets say any weight-loss plan should be run by your veterinarian. Looking for one? See our tips on choosing a veterinarian.
  • Go slowly: a sudden starvation diet can put a cat at risk of hepatic lipidosis (fatty liver disease), which can be fatal if not promptly reversed. Cornell suggests aiming for gradual weight loss of about 1 to 2% of body weight per week.
  • Control calories: in one Cornell example, a cat lost weight slowly and safely on about 70% of the calories needed to maintain her ideal weight. Your vet can calculate the right number for your cat.
  • Weigh at home: Cornell recommends a baby scale to track your cat’s weight between vet visits.

You’re not alone if your cat is a little chubby. In the Association for Pet Obesity Prevention’s 2025 survey, 43% of cat owners described their cat as above ideal weight.

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Sources (checked Oct. 23, 2026): Cornell Feline Health Center: Obesity; Cornell Feline Health Center: Hepatic Lipidosis; Cornell Feline Health Center: Ask Elizabeth; Purina: Fancy Feast Classic Chicken Feast label (PDF); FDA: Animal Food Labeling and Pet Food Claims; APOP: 2025 Pet Obesity Survey; catinfo.org. Sarah’s Pet Sitting isn’t affiliated with Purina or any pet food brand, and we don’t earn anything from the links in this article.