Body fat serves to store energy and to cushion body organs. Vitamins are organic substances essential in small amounts for good health. They play unique roles in chemical reactions in your body. Minerals, like vitamins, are needed in small amounts. Your body uses minerals to maintain bones and teeth, and to help various chemical reactions in your body.
Water is an essential part of every body cell.
You need eight 8-ounce glasses of water every day to regulate your body temperature, for proper kidney function and for every reaction that takes place in your body. You can become dehydrated long before you feel thirsty, so drink water throughout the day. The number of servings that are right for you depends on how many calories you need, which in turn depends on your age, sex, size and how active you are. Most seniors need somewhere between 1,600 to 2,000 calories. Everyone needs at least the lowest number of servings in the ranges.