Why’s My Cat Fat?

Most owners know that their cats are obligate carnivores.  This means feline bodies do not produce all the essential amino acids for survival.  Cats must consume meat to obtain taurine or they will die.  Taurine deficiency can result in various conditions including blindness, tooth decay, enlarged heart and lowered immune response.

For most of their evolutionary past, cats were busy little rodent killers.  They earned a place beside man’s hearth by keeping the mice and rats under control.  Consuming rodents and other small animals provides cats with the taurine they need.  While the modern house kitty may catch and even eat the occasional mouse, most cats subsist on commercial diets.  These are supposed to be balanced foods that meet the nutritional needs of felines.

Unfortunately, far too many house cats are overweight.  I worked for eleven years as a veterinary technician and saw an inordinate number of over-weight kitties.  In the photo above of my own cats, the cat at the bottom, Toby, is quite hefty.  He started out at an optimal weight and body condition and stayed there the first seven years of his life.  His weight gain started when he developed bladder infections and began receiving moist food every evening.  Because I have a multi-cat household, I always have dry food available free-choice and Toby really pigged out.  He is a large-framed cat anyway.  With the extra weight, he topped the scales at nearly 19 pounds.

Over the years I’ve owned many cats.  Most were within fairly normal weight ranges with a few exceptions.  Some just ballooned to overweight as they reached senior age, about 7 years old.  Perhaps the gain was due to lower activity levels.  Or maybe something else is going on?

A review of the guaranteed analysis of the nutritional content of commercial cat food reveals that most dry food provides about 0.1% to 0.2% taurine.  This includes many high end brand names and even prescription diets.  Moist cat food has a taurine content of about 0.05-0.2% with more expensive brands generally having more of the amino acid.  Semi-moist cat foods are in the same boat.  Sometimes the taurine levels in cat food are not even provided on the package.  The consumer must make an effort to find the information.

Taurine is highly water soluble.  It is not possible to over-feed taurine since excess is excreted.  Most cat food is supplemented with taurine due to a significant loss of the amino acid during the cooking process.  Studies indicate the average cat requires 75-100 mg of taurine per day.  Experiences with my own cats leads me to suspect the requirement is actually higher.

For most of Toby’s adult life, he ate only Purina Complete Cat Chow, a dry food.  This was available free choice.  Then at age seven he also started getting 1/2 can of moist Friskies pate per day.  The taurine content of Cat Chow is 0.15% and Friskies canned is 0.05%.  Within a few months the cat’s weight gain was obvious.  It just got worse and worse.  At 16 he was that very heavy cat in the photo.  He also had serious problems with chronic yeast ear infections.

One of my dogs had very itchy skin with chronic yeast in the ears.  After he was switched to a non-chicken diet, his itching and grungy ears all went away.  He had a chicken allergy.  I wondered if my cat had the same problem.  Chicken is a cheap and easily obtained protein that crops up in a majority of commercial pet foods.  During my search for a dry cat food without chicken, I stumbled across Farmina Natural and Delicious.  Beginning in mid-January of 2018 (about one year ago) I changed all my cats to dry Farmina and also cut out as much chicken as possible from the moist food I offer every night.  I also feed about 20% Science Diet Dental Care (a dry food with a large kibble size to encourage chewing) to help keep the cats’ teeth clear of tartar.  This food contains chicken.  We’ve tried to go without Dental Care, but the tartar tends to build up.

Within a few months of the food change, Toby’s ear infections cleared up.  No more scratching at his ears, no more heavy build-up of dark, thick waxy discharge.  He was a happy cat.  The small amount of chicken in the Dental Care didn’t seem to affect him.

Then I began to notice another change.  He was losing some weight.  Another of my cats, Chloe, a female of 5 to 6 years, also had lost some weight.  She had been getting too chunky around the middle.  Now she looked great!  One of my younger cats, Kai, a three-year-old, had been gaining weight and losing the tucked-in waistline of his younger days.  On the new diet he had slimmed down.  All my cats’ coats were looking more sleek and shiny with less shedding and they seemed to have more energy.  What was going on here?

I studied the Farmina label and discovered it contained 0.4% taurine, almost four times the level found in most cat food brands.  The cats were consuming less food, lowering their caloric intake.  My hypothesis is that cats over-consume and gain weight in an effort to ingest sufficient quantities of taurine.  With lowered food intake, all my overweight cats reduced their weight.  Today Toby is about 15 lbs and actually has a waist!

In June of this year we acquired two tiny kittens.  They have grown up eating only free-choice Farmina, moist Friskies pate and Dental Care.  They have the most exquisite, silky, shiny coats and amazing muscle tone.  Their little arm muscles fairly bulge!  These kittens have great body condition, as do all the other cats in the house.  At age 18, even though Toby has arthritic hips, he is active and often playful.  I believe he is feeling much better than before his new diet.  I wonder if other owners of over-weight cats tried increasing taurine levels that they would discover the same results?  It’s worth a try!

Disclaimer:  I do not recommend any particular brand of cat food, do not make endorsements, and have not received benefits or consideration from any cat food manufacturer.

 

 

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4 thoughts on “Why’s My Cat Fat?

  1. That is a very interesting conclusion regarding taurine. I shall check my cats’ food to see how much they are getting from their food.

  2. I tried to respond on the blog page twice but got an error message both times saying the page isn’t working. Very Interesting.  Looking at the Farmina brand offerings, there are a few to chose from.  Do your cats seem to prefer one combination over the others?Our vet recommended dental food for Oreo also, but he doesn’t seem to care for it much – he mostly loves Friskies wet food.  The more gravy the better!  He is going on 14 and maintains his weight pretty well, around 13 lbs, but the new little girl we got in September, Rose, has put on a lot of weight!

    • Not sure what’s going on with the comment link. Your comment is on the page. My cats get Farmina Natural and Delicious Lamb and Blueberries and Fish and Orange flavors mixed half and half. Both of these formulas contain very little chicken. They like the fish flavor best, of course!

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