. Carbohydrates in food provide the body with energy and heat.
Fat - animal and vegetable fats, when you are thinking of them as part of what a person eats.
Protein - a substance, found within all living things, that forms the structure of muscles, organs, etc. There are many different proteins and they are an essential part of what humans and animals eat to help them grow and stay healthy.
Fiber - the part of food that helps to keep a person healthy by keeping the