Nutrition is the observation of nutrients in food, how the body uses them, and the connection between diet, health, and disease. Proteins, carbohydrates, water, fat, vitamins, minerals and fiber are all nutrients. Nutritionists use ideas from molecular biology, biochemistry, and genetics to recognize how vitamins influence the human body. Nutrition also specializes in how human beings can use dietary choices to lessen the hazard of disease, what happens if someone has an excessive amount of or too little of. If people do not have the right stability of nutrients of their diet, their danger of growing positive health situations increases.