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Each nutrient has a particular series of functions in the body and some nutrients are needed in larger quantities than others. For example, protein is needed in gram (g) quantities. Vitamin C is needed in milligram (mg) quantities (1/1000 gram) and vitamin B12 is needed in microgram (µg) quantities (1/1000000 gram). Individual requirements of each nutrient are related to a person's age, gender, level of physical activity and state of health. Also, some people absorb or utilize nutrients less efficiently than others and so will have higher than average nutritional requirements, e.g. among older people, vitamin B12 absorption can be relatively poor.

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