Madini ya chuma na zinc yaliyomo kwa wingi katika nafaka mbambali yanaweza kutumika kwa kiwango kikubwa na mwili kama mtu atakula chakula kilichopikwa kutokana na unga uliokobolewa.
Hii ni kwa sababu nafaka zina kemikali inayoitwa "phytate" ambayo inauzuwia mwili kunyonya madini hizo na kutumika mwilini. Ukikoboa nafaka kama vile mahindi unapunguza kiasikibwa cha kemikali hiyo ya "phytate".
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