Weight Management for Cats: The Catkins Diet!

weight management for cats

Cats are meant to be lean, sleek predators, rippling with muscle.


  1. Diabetes: Diabetes is becoming more common in cats, due to the increase in obesity in cats. Fat actually produces a hormone that causes insulin resistance, making overweight cats much more prone to Type 2 diabetes. For cats diagnosed with early diabetes, just as in people, weight loss can prevent or slow progression to full-blown diabetes.
  2. Joint problems: Cats often develop arthritis. This can limit their ability to feel good and be active (also, inactivity promotes weight gain). They may have difficulty using their litter box comfortably. They may have difficulty grooming. Arthritis is uncomfortable! Pain control in cats is challenging – it’s much better to eliminate the obesity risk factor for arthritis.
  3. Poor sanitation: Many overweight cats cannot groom their rear ends easily due to their inability to reach these areas. They can develop skin rashes, skin infections, urinary tract infections, and odor. Their owners have to clean their bottoms every day! They also have oilier coats, and many develop painful mats on their backs where they cannot groom.
  4. Blood Pressure: Hypertension can develop placing stress on heart, liver and kidneys, often necessitating the inconvenience and cost of additional medications.  


In the wild, cats hunt for their meals, which provides a high protein diet along with many other essential nutrients. Their grain consumption is minimal. Unlike dogs, cats are “obligate carnivores,” meaning their bodies require meat protein to make glucose to fuel their cells. While they can make glucose with carbohydrates, most of the carbs go toward making fat. Unfortunately, almost all commercial dry foods and many canned foods are high in carbohydrates and plant protein. Cats like these foods, but it’s not what nature intended them to eat. For years, we have assumed that dry food is appropriate for cats. It’s easier and they like it, but it’s not the best choice.


In addition to being the best way to achieve and maintain a healthy weight, canned foods benefit cats in other ways. Cats on dry food often do not drink enough to prevent urinary tract disease. The increased moisture in canned food helps reduce the risk of cystitis, bladder crystals, and bladder stones. Cats on low carb canned food are less hungry. Although many people think that dry cat food prevents dental disease in cats, most dry cat foods crumble so they do not offer any cleaning action. There is a prescription dry diet (T/D) that does help keep the teeth clean due a unique matrix that prevents crumbling, but if your cat has a tendency to be overweight, the fact that T/D is not low carbohydrate makes it poor choice for your cat.


weight management for catsToday many cats spend all their time indoors with little to stimulate them to be active. Cats on high carbohydrate diets are actually much hungrier which causes them to overeat. Bored, inactive cats tend to eat more. Overeating even a small amount every day will result in weight gain.


If your overweight cat is eating dry food, slowly transition to a low carbohydrate canned diet. Fancy Feast CLASSIC canned diets are very low in carbohydrates and easy to purchase. They come in many flavors but the can must be labeled Classic. The Classic diets are pate’ style with no gravy or sauce added. Do not assume that all “grain-free” diets are low carb diets, since most of them have added starches and carbohydrate sources. If your cat insists upon eating dry food, Innova EVO is the lowest carb dry food available. Aim for a weight loss of 1-2% of the current body weight per week. For example, if your cat weighs 15 lb, he should lose about 3 ounces each week which is a little more than half a pound in first month.

VERY IMPORTANT: Your cat must consume food within 48 hours or there is a risk of serious health consequences, so do not just give your cat a new food without being sure that they are eating it. It is better to transition a hesitant cat to canned food by very gradually mixing (over weeks) the new food with the old, rather than to try starving them into it - which is dangerous and does not work anyway. Allowing any cat, especially an overweight cat, to go without food for much more than 36 hours can be dangerous and may result in an often fatal liver disorder called hepatic lipidosis.

The average cat should eat 4-6 ounces of canned food per day split between 2-3 meals but this is just a general guideline. One can of Fancy Feast is 3.5 ounces. When determining how much you should be feeding your cat once transitioned to canned food, keep it simple. Too fat-feed a little less. Too thin-feed more.

EXERCISE: Cats are natural athletes but may become sedentary as adults, so take steps to increase their activity. Place food at the top of the cat tree, promote playing, pouncing, stalking and jumping with the aid of “cat dancer” toys or laser pointers, and visit the website of Ohio State University’s Indoor Cat Initiative for more ideas.

Check out our blog: Boredom Buster, for some great games to play with your cat.

MULTI-CAT HOUSEHOLDS: Switch from free-feeding to meal feeding. Put each cat’s food down three times a day, allow them to eat individually, and then pick up uneaten food. Cats on specific diets or amounts can be fed in a room with the door closed or in a cat carrier. Underweight cats can be fed additional times this way.

MONITORING WEIGHT LOSS: The best way to monitor your cat’s weight loss is by weighing your cat regularly on a small digital scale. Purchase a baby scale or bring your pet in weekly to weigh at no charge. An accurate digital scale is a must – slow but steady weight loss is the goal. Write your cat’s weight down weekly. Do not exceed 2 percent weight loss per week which for a 15 pound cat means less than four ounces per week. Hepatic lipidosis (very serious) can occur if your cat loses weight rapidly so you must be careful in monitoring your cat’s weight loss.

WHEN HAVE YOU REACHED GOAL? You should be able to see a waistline when you look down at your cat from above. You should be able to feel the ribs slightly when you run your flat palms across the sides.  If you are uncertain, contact us. Once you and your pet’s doctor agree that a healthy weight has been achieved, you can increase daily food about 10% BUT continue to weigh weekly to be certain that weight gain is not occurring. 

FACT: Risk of death for middle-aged obese cats is nearly three times greater than for cats at an ideal weight.


Fancy Feast is great cat food. However, my cat gained most of her excess weight from just a few cans of the Fancy Feast pate. It appears to have a lot more fat in it. Stick to the Fancy Feast savory broth, sauce variety, or anything but the Fancy Feast pate.

Its actually the chopped / grilled that is lower fat - pates are good for low carb diets (great for cats at risk of type 2 diabetes)

A licensed vet took time to contact all companies and get a breakdown of the food content and the info can be found at catinfo.org

My cat was diagnosed with pancreatitis 5 months ago. I transitioned her to a raw food diet because it easier to digest and better for them. She gained 2 pounds in 4 months! How is that possible with no carbs? My vet told me to put her back on canned Fancy Feast. Does raw food cause weigh gain?

Hi Alessandra,

Thank you for your question. Weigh gain in pets can be for many reasons including but not limited to increased caloric intake from change of diets, availability of calories from treats, environmental access: such as a neighbor feeding or giving treats or obtaining food from sources you may not be aware of, medical issues and/or decrease of activity. Ongoing concerns and past medical history plays a big part in recommending food. We can not recommend a diet over social media. It is best to discuss with your primary veterinarian the increased weight you have noticed and concerns for the diet your cat is on. Together you will be able to develop and plan on what to do next to address your concerns.