Protein, fat, sugar, vitamin and essential trace elements are all vitally important nutrients in maintaining the normal activities of human being. Protein, fat and sugar supply the energy that the body needs. The essential trace elements play very important roles in keeping the whole microcircular system of body working normally. More and more people have attached importance to the deficiency of trace elements. It is shown that the elemental deficiencies not only have relation to the daily intak...
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