What are calories, and how do calorie needs differ from person to person? Here is a worksheet that briefly explains how calories measure the energy supplied by food, as well as suggests the amount of food an individual should eat per day.

Use this interactive calorie calculator to determine what your optimal daily caloric intake is according to your activity level and body type.

The CDC offers a wealth of information regarding several specific topics that fall under nutrition including good health, exercise, diet and more.