Nutrition begins with food.
The science of nutrition concerns everything that the body does with food in order to live, function, grow, and heal. Foods that are eaten on a regular basis make up a diet. Although geographic location and family traditions play major parts in forming dietary habits, food choices vary from person to person. To a high degree, what people eat affects their health and their enjoyment of life. In turn, healthy habits and a happy outlook can improve the ways in which the human body makes use of food.