Consuming wheat and beans with zinc sources like oysters significantly lowers zinc absorption.

“in fact in the book I discuss a study in which voyeurs were administered with and without black beans and tortillas oysters are one of the richest sources of zinc without black beans or tortillas zinc levels rose strikingly and with those foods zinc levels were significantly lower in fact with both of those foods zinc levels did not rise at all when zinc was administered”

“beans are very poorly available sources of zinc and there is a really interesting study which i will show in a moment showing that if you give someone oysters which are a great source of zinc their zinc levels in the blood go up but if you give those oysters with beans the blood levels of zinc are massively reduced”

“if you give those oysters with wheat specifically a tortilla and beans the oysters will not lead to any zinc absorption in the human body”

“if you give those oysters with wheat specifically a tortilla and beans the oysters will not lead to any zinc absorption in the human body”

“this is the change in plasma zinc micrograms deciliter when someone eats 120 grams of oysters alone 120 grams of oysters plus 120 grams of frijoles beans and 120 grams of tortillas zero”

“when oysters are given alone you see a large increase in the plasma zinc because there's a lot of bioavailable”

“there's actually a very interesting study that I've spoken about in the past with wheat and beans specifically showing that when you eat wheat and beans with a source of zinc in this case oysters it's a very interesting study from the 1960s the absorption of that zinc is significantly lowered and in the case of beans and wheat together completely abolished”

“and when you give people that oyster with beans or with a tortilla that absorption of zinc is significantly lessened the levels of zinc in the blood are abreg in fact they go to essentially zero if beans and tortillas are given together”