The Claim
Phytates and polyphenols present in plant-based foods inhibit the absorption of nonheme iron in a dose-dependent manner, with phytate doses ranging from 2 to 250 mg reducing iron absorption by 18% to 82%, and polyphenols from tea reducing iron absorption from fortified bread by 56–72%, primarily through the formation of insoluble complexes with iron in the gastrointestinal tract.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Stuff in plant foods like beans and tea can make it harder for your body to absorb iron, especially if you're eating foods with added iron—because they bind to the iron and make it harder to use.
See the scientific wording
Phytates and polyphenols in plant-based foods inhibit nonheme iron absorption in a dose-dependent manner, with phytate doses from 2 to 250 mg reducing absorption by 18% to 82%, and polyphenols from tea reducing iron absorption from fortified bread by 56–72%, primarily by forming insoluble complexes with iron in the gastrointestinal tract.
What the research says
1 studyStudy: Iron Absorption: Factors, Limitations, and Improvement Methods
The study says that substances in plants can make it harder for your body to absorb iron, but it doesn’t test the exact amounts or prove how much they reduce absorption in real meals.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.