Treating wheat with heat and acid under specific conditions greatly increases the amount of zinc that can be released during digestion, but only slightly improves how much zinc the body actually absorbs, because much of the zinc remains bound to phytate.

We analyzed two assertions about whether hydrothermal processing of wheat increases zinc absorption in humans, and both suggest that making zinc more accessible during digestion doesn’t necessarily mean the body absorbs more of it. What we’ve found so far is that treating wheat with heat and acid can release more zinc from its food matrix, but much of that zinc remains stuck to phytate, a compound that blocks absorption [1]. Even when processing methods like citrate solution treatment improve zinc’s availability in the digestive tract, the human intestine still struggles to take it up because the zinc stays bound in forms that don’t easily release free zinc ions [2]. This means that while the physical amount of zinc that can be released during digestion may go up, the biological reality — how much actually enters the bloodstream — doesn’t follow the same pattern. The evidence we’ve reviewed leans toward the idea that increased bioaccessibility does not reliably translate into increased absorption. The two assertions we examined are equally supported, and neither shows a clear benefit in human zinc uptake despite improved release during digestion. We don’t have enough data to say whether other processing methods, longer treatment times, or combinations with other nutrients might change this outcome. For now, the evidence suggests that simply heating wheat to unlock more zinc isn’t enough to ensure your body gets more of it. If you’re trying to improve zinc intake from plant foods, other strategies — like soaking, fermenting, or pairing with vitamin C — may still be worth exploring, even if the science on them isn’t fully settled either.