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In addition to carbohydrates, fats, proteins, mineral salts and water, it is essential that the food of man and animals contains small amounts of the substances called vitamins, which the living organism is unable to manufacture by itself and which have to be supplied from other sources, namely diet. If anyone of same fifteen of more of these compounds is lacking in the diet, there occurs eventually a breakdown of metabolic processes that results in symptoms of malnutrition that are classed, at the deficiency diseases.