How to Help Fat Cats Lose Weight

fat cat
Fat Cat, Brokinhrt2, Flickr

Cheap dry cat food has sparked an obesity epidemic among cats in countries where high-carbohydrate pet foods are readily available.

Obesity presents serious health risks to cats, but a weight loss program will only work if the changes are maintained for the rest of the cat’s life. Crash diets don’t work with cats any better than they work with people. The cat simply experiences feelings of starvation and either fails to lose much weight or loses weight rapidly and then puts it back on when the diet is over. Permanent lifestyle changes are required to maintain a healthy weight for life.

Causes of Obesity in Cats

Risk factors for obesity in pets include:

    • Genetic predisposition to large appetite and/or slow metabolism (some breeds are more inclined to become obese than others)
    • Certain health conditions and medications
    • Sedentary lifestyle
    • Laid back personality (high-strung animals tend to get more exercise)
    • Being fed and given treats by many different people in a household
    • Free feeding, particularly if using large food bowls
    • Having the opportunity to steal food from other pets
    • Being fed a high-carbohydrate diet

The latter factor is probably the most common cause of obesity in cats. A diet of cheap, dry kibble is not really a bargain, as it can have serious health consequences in the long run.

How to Tell if a Cat Is Overweight

Answering the following questions will help to determine whether a cat is overweight to an unhealthy degree:

    • Is the cat relatively sedentary? Does he have trouble running, jumping, and climbing?
    • Do the sides of his body form straight lines when viewed from above, or does he bulge out at the sides?
    • When viewed from the side, does his belly form a straight line that runs parallel to the floor, or does it curve downward?
    • Can you feel his ribs with your fingers, or is there a lot of fat overlying them? His ribs shouldn’t be visible, but you should be able to feel them.

A veterinary consultation is necessary before embarking on any weight loss program because health issues must be taken into account when determining the best and safest approach.

Health Problems Associated with Feline Obesity

Being overweight and sedentary can have serious health consequences for cats, including increased risk for:

    • Arthritis and other joint and mobility problems
    • Bladder infections (if obesity makes it difficult to groom properly)
    • Breathing difficulties
    • Cancer
    • Constipation
    • Decreased immune function
    • Diabetes mellitus
    • Hypertension
    • Incontinence
    • Liver disease
    • Lower urinary tract disease
    • Surgical/anaesthesia complications
    • Weakened immune system

Existing kidney and heart disease may also be accelerated by excess weight.

How to Help Your Cat Lose Weight

Helping cats lose weight requires reducing daily calories and increasing exercise levels. To reduce food intake:

    • Don’t free feed – provide a measured quantity of food at each meal.
    • Have one adult or responsible older child take charge of feeding all pets, and don’t allow other members of the household to offer food between meals.
    • In multicat households, feed each cat in a separate room with the door closed to prevent food stealing.
    • Offer calorie-free treats such as catnip, or provide attention and affection in place of extra food and treats.

Unless your cat has a medical condition that makes walking, running, and other forms of exercise painful, the following approaches can be used to increase his daily activity levels:

    • Play with the cat daily so that he can make use of his hunting skills.
    • Feed the cat in a remote area of the house so that he has to expend more energy to get his food.

Weight reduction programs require veterinary supervision. Be sure to take your cat in for regular progress assessments and health checks.

What to Feed Cats for Weight Loss

Cats that need to lose weight should be fed a high-protein diet. While low-fat, high-fiber diets are often recommended for fat cats, not all cats lose weight on these diets, and many develop dry, flaky coats, and in some cases, more serious health problems.

Fiber suppresses appetite to some degree in people, but it doesn’t have this effect on cats, because while people are omnivores, cats are obligate carnivores. This means that cats on high-fiber diets eat more in an attempt to satisfy their protein requirements, or suffer feelings of starvation if fed controlled portions.

The best way to promote healthy weight loss for cats is by feeding a high-protein canned wet food. Cats feel full without eating as much because their protein requirements are met, and the water content of the food means that the same portion contains fewer calories. Look for foods for which meat (not wheat, rice, corn, or by-products) is the first ingredient listed on the label.

For more cat articles, see the main Cats page.


    • Barchas, Eric, DVM. (2009). “Obesity n Cats.”
    • Fox, M.W.; Hodgkins, E.; & Smart, M.E. (2008). Not Fit for a Dog! The Truth About Manufactured Dog and Cat Food. Linden Publishing.
    • Wynn, Susan, DVM. (2003). “Weight Problems in pet Animals—Do Diet Foods Work?”

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