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Freebase(0.00 / 0 votes)Rate this definition: Nutrient. 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. They are used to build and repair tissues, regulate body processes and are converted to and used as energy.
Essential meaning that if a nutrient is not present, aspects of function and therefore human health decline.When nutrient intake does not regularly meet the nutrient needs dictated by the cell activity, the metabolic processes slow down or even stop..onsider that in light of Webster's definition of medicine: . The science and art dealing with the maintenance of health and the prevention, alleviation, or cure of disease.  Food acts as medicine, to maintain, prevent, and treat disease.