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Hay diet

 A system of eating based on the concept that carbohydrates and proteins should not be eaten at the same meal, for which there is no scientific basis, originally proposed by William Hay in 1936. It ignores the fact that almost all carbohydrate-rich foods also contain significant amounts of protein. In any case, in the absence of adequate carbohydrate, protein is oxidised as a metabolic fuel and therefore not available for tissue building. Also called combining diet or food combining.