The document discusses the four main nutrients found in food and how they help the body function. It explains that carbohydrates like bread, pasta and potatoes are the main source of energy; proteins from foods like fish, beef and beans are used to replace, repair and grow new cells; vitamins and minerals from fruits, vegetables and milk help nerves work; and natural fats from foods like butter, oil and ice cream provide energy, keep skin healthy, and help the body use vitamins.