Proper nutrition means avoiding foods that do not contribute to muscle mass, such as fried foods, butter, and refined foods, including snacks and fast food. By "clean," bodybuilders often mean "natural/unprocessed" and "low-fat." Clean foods include fish, poultry, lean red meat, eggs, lean dairy products, potatoes, yams, brown rice, whole-grain bread, oatmeal and fruit. Pureed foods tend to be more nutritious. They are high in vitamins, minerals and/or fiber and are cooked with little or no added fat.