Phytin
Phytate/phytin is the principal antinutrient in cereals and legumes, binding minerals (iron, zinc, calcium) and reducing their bioavailability. WHO/EFSA acknowledge moderate phytate intake reduces non-heme iron absorption and is a concern in populations with marginal mineral status.
What it is
The calcium-magnesium salt of phytic acid (inositol hexaphosphate, IP6); naturally found in seeds and grains.
Naturally occurring storage form of phosphorus in plants; sometimes used as a chelating agent or supplement; not a common added food additive.
Why it's flagged
- chelation reducing iron and zinc absorption
- concerns for at-risk groups (infants, pregnant women, vegetarians)
What regulators actually say
"Phytate is the most potent inhibitor of iron absorption from plant foods."
"Phytate intake reduces zinc absorption; the molar ratio of phytate to zinc is a useful predictor of zinc bioavailability."
Regulatory status
United States — FDA
Naturally present in foods; phytate-based supplements regulated under DSHEA.
European Union — EFSA
EFSA acknowledges phytate's effect on mineral absorption in nutrient-intake assessments.
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