antinutrient

noun
an·​ti·​nu·​tri·​ent | \-ˈn(y)ü-trē-ənt \
variants: or anti-nutrient

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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