Tannins
Polyphenols in tea, wine, and some foods that can impair iron absorption and cause digestive issues.
Tannins are polyphenolic compounds found in tea, red wine, pomegranates, and many plant foods. While they have antioxidant properties, high tannin intake can bind to iron and reduce its absorption, cause nausea or digestive discomfort in some individuals, and affect gut motility. People with iron deficiency should be mindful of consuming tannin-rich foods with iron-rich meals.
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