Consuming 2.34 grams of phytate daily with a liquid diet lowers the amount of zinc the body absorbs by nearly half, from 34% to 17.5%, when the ratio of phytate to zinc in the diet is 15:1.

We analyzed the available evidence and found that consuming 2.34 grams of phytate per day with a liquid diet appears to reduce zinc absorption in healthy young men, dropping it from 34% to 17.5% when the phytate-to-zinc ratio is 15:1 [1]. This means that for every 15 parts of phytate, there is 1 part of zinc in the diet, and under those conditions, the body takes up about half as much zinc as it normally would. Phytate is a natural compound found in plant foods like whole grains, legumes, and nuts, and it can bind to minerals like zinc, making them harder for the body to absorb. The evidence we’ve reviewed so far comes from one specific study setup — a liquid diet — and shows a clear drop in absorption under those conditions. We have not seen any studies that contradict this finding. However, we also haven’t seen data on how this plays out in regular meals, over longer periods, or in other populations like women, older adults, or people with different diets. What we’ve found so far suggests that high phytate intake, especially when paired with low zinc, may limit how much zinc the body can use. For someone eating mostly plant-based foods with little zinc-rich meat or seafood, this could matter more. If you’re concerned about zinc levels, pairing phytate-rich foods with vitamin C or soaking/fermenting them may help, but more research is needed to know how this affects real-world eating habits.