The present invention encompasses compositions and methods for the prevention and treatment of age related conditions in animals, particularly in companion animals, in need thereof. The methods for treating or preventing an age-related condition in an animal in need thereof, comprise administering to the animal an effective amount of a composition comprising at least one of a protein source, a carbohydrate source, a vegetable source, a fruit source, or a combination of two or more thereof. In this method, the protein source is selected from the group consisting of chicken, egg protein, corn gluten meal, and combinations thereof； the carbohydrate source is selected from the group consisting of millet, brewers rice, oat groats, and combinations thereof, the vegetable source is selected from the group consisting of carrots, spinach, tomato pomace, and combinations thereof, wherein the fruit source is citrus pulp.
