Nutrition is the process by which food is taken in by living organisms in order to supply the nutrients required for the continuous metabolic reactions going on in the body. Food is the source of nutrients.   Usefulness of Food Living cells or organisms require food for various reasons. These reasons are: To provide energy needed for various physical and metabolic activities. To make essential substances such as hormones and enzymes. To make new cells for growth and replacement of worn-out tissues. To supply various substances required for healthy growth and development.   Types of Nutrition There are two major types of nutrition. These are autotrophic and heterotrophic nutrition.  …

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