For our bodies to work properly we must eat the right kinds of food. There are five main groups of food. These are carbohydrates, fats, protein, minerals and vitamins. Fats and carbohydrates are the chief energy-giving foods. They include bread, butter, potatoes and sugar. Proteins are essential for health and growth and are found in cheese, eggs, fish, milk and meat. Only small quantities of vitamins and minerals are needed but they are important. Vitamin sources include fresh fruit and vegetables, meat and milk. Calcium for healthy bones and teeth, and iron are two of the most important minerals. Calcium is found in cheese, milk and fish, and iron in meats such as liver and in green leafy vegetables like spinach.
Text taken from http://www.col.org/diet-and-health.html