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Obesity is a huge and rapidly growing problem in cats, dogs and people. Increased adiposity (fatness) leads to an increased risk of ill health.
Fat cells promote inflammation (via the production of adipokines), which in turn is associated with a plethora of disease states (including heart disease and cancer). Lower adiposity (less fat) decreases the production of adipokines.
Lean animals produce fewer inflammatory adipokines, thus conferring upon them a level of protection from many chronic diseases.
Over the last few decades, the prevailing view has been that of 'calories in versus calories out':If more calories are eaten relative to the calories that are expended through exercise, then weight gain will result. There is an implication that being overweight is to do with greed and laziness.
More recently the view has changed. It is now known that weight management is much more complex. The following factors warrant consideration:
Whether a fat cell chooses to release its contents for energy use, or store them as fat (promoting weight gain) is largely determined by hormones - such as insulin, estrogen and testosterone.
Insulin has been identified as the most influential in stimulating fat storage. Food intake largely determines insulin response. Insulin is produced mostly in response to carbohydrate intake (and a lesser amount for protein intake). Cereal grains in particular cause large insulin spikes.
Of all the factors mentioned above - the only one that you can't change is the genes within the DNA (although the expression of these genes can be influenced by external factors).
According to Gary Taubes, calorie restriction drives hunger - so an easier approach to weight loss is to focus on the type of calories (bearing in mind that even 'good' calories can promote weight gain if they are eaten to excess). The best calories for weight control come from high quality, species-appropriate proteins and fats. A healthy diet will also support good microbiome health, which in turn will support the immune system, thus reducing the likelihood of needing antibiotics.
Most people find that raw-fed pets easily maintain an ideal BCS. The normal level of protein in this diet (compared to the low protein in processed and grain-free diets) helps them to regulate and satisfy their appetite. Some of you may need to increase or decrease food intake a small amount to help your pet achieve an optimal size. Let us know if you need help with this.
Body Condition Score charts (cats, dogs) imply that thin pets are less healthy. The human version of a Body Condition Score chart - BMI - also suggests that thin people are unhealthy (a BMI under 18.5 is considered underweight). That thinness means ill health will certainly be true in some, but not all cases.
Two body condition factors are associated with longevity: adiposity, and lean muscle mass. There is evidence that low adiposity (leanness) combined with higher lean muscle mass leads to longer life spans. In other words - it is ok for your dog or cat to be on the lean side, as long as they have good musculature.
If any of the above occur (or you are worried for any other reason), you need to check in with your vet.
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