A nutrient is a chemical that an organism needs to live and grow or a substance used in an organism's metabolism which must be taken in from its environment.
An essential nutrient is a nutrient required for normal body functions that either cannot be by by the body at all or cannot be make in amounts adequate for good health. Some types of essential...
A nutrient is a substance that provides nourishment essential for growth and the maintenance of life. The main groups are carbohydrates, protein, fat, vitamins, minerals and water.