| Individual response to nutrients varies: this variation is to a substantial extent the result of the genetic variation. Genes influence structures and functions associated with the digestion and absorption of nutrients, their metabolism or their excretion. Perceptions such as taste or satiation are also, to an extent, genetically determined. All this has practical implications: because the gene pool varies between populations, it seems that the optimal nutritional guidelines should be population-specific, rather than general.
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