Leaching foods deplete the body of vitamins and minerals. They drain the body's vitamin stores by preventing absorption, breaking down nutrients or damaging tissues such as bone. Minerals, including calcium, magnesium and iron are especially prone to leaching.eaching foods deplete the body of vitamins and minerals. They drain the body's vitamin stores by preventing absorption, breaking down nutrients or damaging tissues such as bone. Minerals, including calcium, magnesium and iron are especially prone to leaching.