Human beings require more than 50 essential nutritive substances, mainly in our diet. The necessary inorganic substances are called minerals and they are normally found in very small proportions or
what is called trace amounts or oligoelements in foods; organic substances that cells require and which contain nitrogen are called amino acids and they are the building blocks of peptides and
proteins; other organic trace substances are generally called vitamins.At the cellular level, DNA controls the metabolic machinery in both plants and animals. The question reduces to whether plant
or animal DNA holds the key to the nutrition which produces the best health care in humans? According to Linus Pauling (Nobel price Chemistry 1954, Peace 1962), the study of evolution and the
single celled organisms provides an important clue. Primitive cells, bacteria and even plants are examples of organisms that must be able to synthesize more of the chemicals that they require for
existence than the organisms capable of movement require.We are accustomed to thinking of human beings as the highest of all species of living organisms. In one sense they are: They have achieved
effective control over a large part of the earth and have even begun to extend their realm as far as the moon and Mars. But in their biochemical capabilities they are inferior to many other moving
organisms, plants and even unicellular organisms, such as bacteria, yeasts, and molds. The red bread mold (Neurospora), for example, is able to carry out in its cells a great many chemical
reactions that human beings are unable to carry out. The mold can live on a very simple medium, consisting of water, inorganic salts, an inorganic source of nitrogen, such as ammonium nitrate, a
suitable source of carbon, such as sucrose, and a single vitamin, biotin. All other substances required are synthesized using the mold's internal biochemical mechanisms. It does not need to have
any amino acids in its diet, because it is able to synthesize all of them and also to synthesize all of the vitamins except biotin.
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