Medical Definition of antinutrient
: a naturally-occurring substance (such as saponin or tannin) found in plant-derived foods that interferes with absorption or proper functioning of nutrients in the body Oxalate is called an “anti-nutrient” because it binds with calcium and some other minerals so they cannot be absorbed.—Chris Rosenbloom, The Atlanta Journal-Constitution, 29 Sept. 2009; also : a substance (such as refined sugar or alcohol) that has little nutritive value and that typically depletes the body of more nutrients than it provides when metabolized
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