Step two is to eat protein with every meal. Good sources of protein are chicken fish eggs cottage cheese. Protein is used to repair and build cells in your body. Muscle needs protein to repair and maintain itself. If your muscles don't get the protein they need they will start to breakdown. This is bad for your metabolism as muscle is metabolically active tissue that burns a lot of calories the less you have the lower your metabolism. Eat protein with every meal to keep your muscle maintained and your metabolism high.