Each type of nutrient has a basic function, though each interacts with the others to carry out their functions. Carbohydrates are found in whole grains, potatoes, cereals, pasta, vegetables and fruits. Proteins are needed for the growth and repair of body cells. It's essential for the production of antibodies that fight infection. Lean meats, poultry, fish, eggs, dried peas and beans are good sources of protein.
Fats provide energy, aid digestion and the use of some vitamins.
Too much fat, however, can be harmful. Good sources of fats are liquid vegetable oils such as olive, peanut, and canola. Vitamins are necessary for normal body functioning. They're important for strong bones and teeth, good vision and resistance to infection. Fruits, vegetables, dairy products and whole grains are good sources of vitamins.