We've added a new topic Macronutrient in How to Lose Weight

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.Whitney, Elanor and Sharon Rolfes. 2005. Organic nutrients include carbohydrates, fats, proteins (or their building blocks, amino acids), and vitamins. See healthy diet for more information on the role of nutrients in human nutrition. Types ...Macronutrient