03/06/2023
To my cat loving friends - I'm on my soapbox again.
Dry Cat Food Linked to Obesity and Feline Lower Urinary Tract Disease
A study published in 2011 in the Journal of Feline Medicine and Surgery2 took a look at risk factors for urethral obstruction, clinical signs, outcomes, and recurrence rates in 82 cats. Urethral obstruction (UO) is a very common, life-threatening condition in cats and is one of several conditions that fall into the category of Feline Lower Urinary Tract Disease (FLUTD).
Notably, the cats with UO were significantly younger than a control group of healthy kitties, significantly heavier, and most (over 80 percent) were fed dry food only. Not one of the 82 cats with UO was fed an exclusively wet food diet.
Cats need moisture-rich diets because they don’t have a strong thirst drive compared to other species. They are designed to get almost all the water they need from the food they eat. Cats in the wild hunt prey, and prey consists of about 75 percent water. Canned cat food contains at least that much moisture. Dry food, on the other hand, contains only about one-tenth that amount.
The bodies of felines aren’t built to digest carbohydrates efficiently, and dry pet food is typically loaded with carbs. Cats lack the necessary enzymes to break down and digest carbs, or turn them into energy. The majority of carbs in a cat’s diet are therefore stored as fat. Given the ingredients in most dry cat food, it’s easy to see from a physiological standpoint how cats become overweight.
Moisture-Rich Diets Help Prevent/Resolve Obesity in Cats
Researchers at the University of California, Davis conducted a study to determine how the water content in food affects the amount cats eat and their body weight.3
The study involved 10 young, healthy, intact male cats, and results showed that consumption of canned food resulted in less food eaten, a decrease in body weight, and no change in body composition (lean body mass, fat body mass, and total body water).
The UC-Davis researchers concluded that canned (wet) diets result in cats voluntarily eating less and a corresponding reduction in body weight. Further, nutritional content and digestibility were not compromised, which is a big concern with low fat/weight loss dry cat food formulas. Also, the kitties "greatly preferred" the canned (wet) diets.
I can't emphasize enough the importance of transitioning any cat still eating kibble to a canned food diet, and then ideally to a balanced, species-appropriate raw diet.