Carbohydrate metabolism, especially lipogenesis is surveyed on the base of literature data. It does not have role in obesity. From among plasmlipids only triglicerid level increases in case of extremely high carbohydrate consumption. Sugar is one of the risk factors of caries, but not the only one. Sugar helps learning and remembering functions of brain, and it may effect on behaviour as well. Oligosacharides can contribute to the favourable intestinal flora. In case of balanced nutrition carbohydrates included sugars do not have unfavourable role in the evolution of diabetes mellitus, obesity or cardiovascular diseases.
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