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Nitrogen balance is a measure of nitrogen input minus nitrogen output

Nitrogen Balance = Nitrogen intake - Nitrogen loss

Nitrogen is a fundamental component of amino acids, which are the molecular building blocks of protein. Measuring nitrogen inputs and losses can be used to study protein metabolism. 

Franz Kafka

Now I can look at you in peace; I don't eat you any more.

Nutrients

Nutrient - a substance that provides essential nourishment for growth and the maintenance of life. 

Foods are composed chiefly of carbohydrates, fats, proteins, water, vitamins, and minerals. Carbohydrates, fats, proteins, and water represent virtually all the weight of food. Carbohydrates, fats, and proteins comprise 90% of the dry weight of foods. 

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