20 Healthy Tips for 2020 20 Healthy Tips for 2020

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Crafty Ways to Slim Down an Overly Plump Cat

Analysis by Dr. Karen Shaw Becker

how to slim down an obese cat

Story at-a-glance -

  • Over half the cats in the U.S. are overweight or obese, and therefore candidates for a wide range of degenerative diseases
  • Many cat parents can’t tell the difference between a kitty who is overweight and one who is a normal weight
  • To help your cat lose weight, feed a fresh diet, calculate daily calories yourself, don’t free-feed, offer limited treats, and encourage him to exercise
  • It’s very important that cats lose weight very gradually to maintain their overall health

An estimated 60% of cats in the U.S. are overweight or obese,1 and since fat felines are now in the majority, many pet parents have lost the ability to tell the difference between a too-heavy kitty and one who is a normal size.

How to Recognize an Overweight or Obese Cat

If you're unsure about your own cat, stand over her and look down at her. Does she have a tapered in waist? If not — if she’s shaped more like an oval, she's probably overweight. You should also be able to feel (but not see) her ribs as well as the bones near the base of her tail. If she's obese, you should be able to easily see excess fat on her abdomen, hips and neck.

You can also compare her to this body condition chart provided by the World Small Animal Veterinary Association (WSAVA):

wsava bcs chart cats

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Image courtesy of World Small Animal Veterinary Association (WSAVA)

The goal for cats is a body condition score of 5. Unfortunately, many cat guardians assume their pet's body score is fine because their veterinarian never mentions a weight issue during exams. It’s important to realize that vets fail to address extra pounds for many reasons, including because it can be an uncomfortable conversation.

That’s why it’s not safe to decide that no news is good news when it comes to your cat’s size. It’s important to face the reality of the situation, because many degenerative diseases can be avoided with appropriate weight management. The following are five of my top recommendations for slimming down a too-heavy cat.

#1 — Feed Fresh

Cats need a diet high in animal protein and moisture, with low to no grain or starch content. A high-quality fresh food diet is the best choice for pets who need to lose weight. It's important to adequately nourish your cat’s body as weight loss occurs, making sure his requirements for key amino acids, essential fatty acids and other nutrients are met.

The key to healthy weight loss is to meet your kitty's nutritional requirements through a balanced diet but feed less food (portion control), which forces his body to burn fat stores. The first step is to transition him to a diet free of potatoes, corn, rice, soy and tapioca to get the carb content down to a biologically correct value of no more than 20% with a goal of less than 10% for healthy cats.

My recommendation is a nutritionally balanced homemade fresh food diet of lean meats, healthy fats, plus fibrous vegetables and low glycemic fruits as the only sources of carbohydrates. These “healthy” carbs are the perfect way to maintain your cat’s microbiome, while providing fiber, antioxidants and phytonutrients.

It’s important to avoid feeding your favorite feline a starch-heavy, carbohydrate-laden ultra-processed diet. Processed pet foods are a significant contributor to the cat obesity epidemic in the U.S. Many pet parents overfeed, but very often the problem is also the quality of food in addition to the quantity. If you're feeding a dry diet, while it might be free of grains, it can't be free of carbs, because carbs are necessary to form kibble.

If you look at the package label, you'll see potato, sweet potato, lentils, peas (pea starch), chickpeas, tapioca and/or other carbohydrate sources. Starch breaks down into sugar, even though you don't see sugar on the pet food package label.

Many dry cat foods are loaded with carbs (40% to 50% of total content in some cases), which can lead to blood sugar fluctuations, insulin resistance, obesity, diabetes and other health problems in cats. Carb intake above the daily needs of your kitty (less than 10%) activates internal enzyme factors that go to work storing the excess as body fat.

Calculate the carbs in your kitty’s diet by adding up the moisture, fat, protein and ash (estimate 6% if you don’t see this value listed) on the pet food label and subtract this value from 100: this is the amount of carbs in your cat’s diet.

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#2 — Calculate Calories

Most people who feed commercially available pet food tend to follow the suggested feeding guidelines printed on the package, which often isn’t the best approach. These recommendations typically use overly broad weight ranges such as “under 20 pounds” when clearly, a 15-pound cat requires significantly less calories than a 5-pound kitty.

Package feeding instructions also use wide serving ranges, such as “feed ½ to 1 ½ cups.” These suggestions obviously can’t take into account, for example, an animal’s activity level, and they tend to be short on other important details, such as whether “feed ½ to 1 ½ cups” is a daily or per-meal guideline.

Instead, feed your overweight cat to achieve weight loss. Decide (with the help of your veterinarian, if necessary) what his ideal weight should be. Then use the following formula to calculate the precise number of calories to feed daily to get him down to his ideal weight and maintain it.

Let’s say your cat’s ideal weight is a slender 12 pounds rather than her current weight of 16 pounds:

Daily calories (feline) = Body Weight (kg) x 30 + 70 x 0.8

Her ideal weight of 12 pounds divided by 2.2 converts to 5.5 kilograms; now the formula looks like this:

Daily calories = 5.5 (kg) x 30 + 70 x 0.8

And finally, it looks like this:

Daily calories = 188

#3 — Encourage Hunting Behaviors at Mealtime

Don’t free feed your kitty, also known as hosting an all-day all-she-can-eat buffet. This feeding mistake goes hand-in-hand with a poor-quality diet, specifically kibble, because it's the only type of food you can safely leave at room temperature day and night. Free feeding is the perfect way to create an overweight or obese cat. In addition, a constantly available food source turns your carnivorous hunter into a grazer, which goes against her feline nature.

Wild cats are always on the move in search of their next meal. Many domesticated cats, on the other hand, are free fed. The more you feed, the less interested your kitty is in "hunting" — which is good exercise — around the house. If the only time you see her in motion is when she’s walking to or from the buffet, she’s getting zero exercise.

Separate her daily food allotment into several small portions and place them in different locations around the house for her to find. Make use of indoor hunting feeders, which encourage natural feline behaviors and provide mental stimulation as well.

Also consider putting food bowls or the hunting feeders at the bottom and top of as many flights of stairs as you have to encourage muscle-building exercise throughout the day. Alternatively, you can feed two portion-controlled meals a day, however, feeding just once a day offers a number of health benefits, including a lower risk of diabetes.

#4 — Less Is More When It Comes to Treats

Treats — even very high-quality healthy varieties — should make up less than 10% of your cat’s daily food intake. It's also important to remember that treats aren't a complete form of nutrition and should never be used in place of nutritionally optimal, species-specific meals. Overfeeding treats on top of daily food intake will result in an obese cat, and overfeeding treats while underfeeding balanced meals will result in nutritional deficiencies.

Limit treats to training and behavior rewards only. Again, keep treats at or fewer than 10% of kitty’s daily food intake, which means offering very small amounts, very infrequently.

When choosing commercially available treats, make sure they’re high quality and sourced and made in the U.S. A high-quality pet treat won’t contain grains or unnecessary fillers, rendered animal byproducts, added sugar (sometimes hidden in ingredients like molasses and honey), chemicals, artificial preservatives or ingredients known to be highly allergenic.

A better idea is to offer very small amounts of fresh human foods as treats, for example, berries, other safe fruits (e.g., melons and apples), cheese, frozen peas, raw almonds, cashews, and sunflower seeds. For ideas on preparing homemade treats for your kitty companion, download my free e-book "Homemade Treats for Healthy Pets," where you’ll find lots of nutritious, easy-to-prepare recipes.

#5 — Bring Out the Natural Athlete in Your Cat

You’ll never see a fat cat in the wild because they follow their natural instincts, which includes the drive to be physically active.

Consistent daily exercise, including at least 20 minutes of aerobic activity, will help your chunky kitty burn fat and increase muscle tone. For some great ideas to get the ball rolling, check out 10 ways to help your cat exercise.

Remember: Cats Must Lose Weight Slowly and Safely

It’s extremely important that you diet your cat slowly. I recommend weighing her every week until she reaches her ideal body weight. Once that’s accomplished, you can weigh her every four to six months to ensure that she’s staying at her new healthy weight. And keep in mind that weight gain in cats happens in 1- and 2-ounce increments over time, so you must stay very firm on holding her at her ideal body weight.

If your cat is obese, she’ll need to lose no more than ½ pound a month, because overweight kitties are prone to a very serious condition called hepatic lipidosis, or fatty liver disease. This condition never happens in nature, because animals in the wild never become obese. Captivity has created some really strange metabolic diseases in animals, and fatty liver disease in felines is one of them.

As an obese cat’s body senses weight being lost, it begins to mobilize accumulated stores of fat very rapidly. If weight loss occurs too quickly in an obese cat, the flood of fat can overwhelm the liver and shut it down. Very overweight cats are more prone to this life-threatening condition because their percentage of body fat is so high. If your cat is only mildly overweight, she can probably safely lose up to 1 pound a month.

What’s important is that your cat’s weight goes down and not up. But her weight loss should progress very slowly and steadily over time. You should see measurable weight loss every month, but some kitties should lose weight much more slowly than I’ve outlined here, due to existing medical issues, like diabetes or other chronic conditions.

Be sure to work with your veterinarian to determine a safe, healthy amount of weight loss for your individual cat, and the rate at which the weight loss should occur. It’s also very important not to change your cat’s food while she’s dieting. If she rejects a new food and won’t eat, it can trigger a whole host of metabolic problems, including fatty liver disease.

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