Annamaya Kosha reminds us that we physically become what we eat. So it is important to know and understand what we are eating so as to keep our body in optimum health. This is the first of five sheaths or koshas, of the physical self, named from the fact that it is nourished by food. This is the physical sheath, or physical body, and is the most tangible aspect of ourselves. You can ready my detailed blog article on this topic here.