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what is nutrition?give example

Nutrition is the science that deals with all the various factors of which food is composed and the way in which proper nourishment is brought about. The average nutritional requirements of groups of people are fixed and depend on such measurable characteristics such as age, sex, height, weight, degree of activity and rate of growth. The modes of nutrition in animals revolve around Holozoic, Parasitic, and Saprophytic. Holozoic as the word suggests means the whole of animal and in this type the organism takes in the entire organic food and this can be in the form of whole body part, part of body organ or even whole grains or mix of grains.
By taking in the entire body parts the animal breaks these big macro molecules into simpler forms by means different digestive enzymes. Once the big molecules are broken down it is absorbed into the body cells of the organisms.
The steps that are followed for these breaking down and absorbing into the body cells are as follows: ingestion, digestion, absorption, assimilation and egestion.
We humans and other animals fall under this category of nutrition.


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