One piece of common nutrition information is that carbohydrates are the main source of energy for the brain, which helps the body function properly. Carbohydrates are most common in fruits, breads, grains and starchy vegetables. Another common fact is that proteins help repair body tissues.
Proteins get broken down into amino acids, of which there are 20. Of these 20 amino acids, the body produces 11, while people must consume the other nine, also known as essential amino acids, through healthy sources such as lean meat, eggs, dairy and beans. Fat is also an important part of the diet because it is an energy source and helps absorb fat-soluble vitamins, such as A, D, E and K. The best sources of fat include fish, nuts and vegetable-based oils.