Therapeutic diets are formulated to help manage signs of disease or slow disease development. Diets formulated to address kidney disease, for example, can slow progression of the disease in pets and improve their quality of life. Therapeutic diets usually contain more defined ingredients, and variation in ingredients is minimized in order to help avoid altering the composition of the food. Ingredients tend to have tighter quality-control standards, and the designs don’t change unless new scientific information becomes available. Because they’re intended for pets with specific health conditions, these diets are only available through veterinarians and should be used under veterinary supervision.