Feline Weight Loss: Why High-Fiber Dry Food Does More Harm Than Good

For overweight cats, high-fiber “weight loss” dry diets are detrimental, despite common perception. These kibbles impede the absorption of vital nutrients like trace minerals, vitamins, and antioxidants in the small intestine, leading to cellular-level nutrient deprivation and chronic hunger, often resulting in an undernourished yet still overweight cat. Furthermore, cats, as carnivores, lack the enzymes to efficiently digest carbohydrates and fiber, which are often stored as fat. Dry food also inherently lacks the moisture crucial for felines, who have a poor thirst drive and are designed to get most hydration from their diet. This leads to chronic dehydration, potentially causing organ failure and constipation.

The article advocates for a species-appropriate approach: a moisture-rich, homemade fresh food diet high in animal protein and healthy fats, with minimal fibrous vegetables as the only carb source. Portion control, calculated based on the cat's ideal weight, is essential, and treats should be drastically limited or made from small portions of the main diet. Rapid weight loss is dangerous, risking a fatal liver condition called hepatic lipidosis, so the transition must be gradual.

Alongside dietary changes, consistent high-intensity exercise is vital, with at least 20 minutes daily. Activities that stimulate a cat's hunting instincts, such as laser toys, food-dispensing “mice,” or even harness walks, are recommended. Studies, like one from UC-Davis, support that moisture-rich diets help cats eat less, lose weight naturally, and maintain healthy body composition without compromising nutrition, contrasting with the problematic high-fiber dry food approach.

(Source: https://www.barkandwhiskers.com/2018-09-25-nl-food-for-overweight-cats/)