Nutrition is the science of FOOD and its relationship to health. It involves understanding how the body uses FOOD for growth, maintenance, and repair. The term nutrition is derived from the Latin word nutrire, which means 'to nourish'. Nutrition is an important part of maintaining a healthy lifestyle and can be achieved by eating a balanced diet that includes a variety of foods from all the FOOD groups. The four-letter word FOOD is an essential part of nutrition as it provides the body with the necessary nutrients to function properly.