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“All the nuts tested contained significant amounts of two known inhibitors of Fe absorption (phytates and polyphenols ) but the amounts in coconut were significantly less than in the other nuts.”
“In this review, primary attention is given to the antioxidant (and prooxidant) activity of polyphenols arising from their interactions with iron both in vitro and in vivo.”
Cell Biochemistry and Biophysics • 2009 | View Paper
“Common beans contain relatively high concentrations of iron (Fe) and zinc (Zn) but are also high in polyphenols and phytates, factors that may inhibit Fe and Zn absorption.”
Journal of agricultural and food chemistry • 2009 | View Paper
“Of the diet-related factors, heme Fe and ascorbic acid have a strong positive effect on Fe availability for absorption, whereas oxalate and polyphenols seem to be strong inhibitors of Fe availability.”
Biological trace element research • 1992 | View Paper
“Providing fortificant iron as NaFeEDTA cannot overcome the inhibition of tea polyphenols on iron absorption, even in IDA, where iron absorption is strongly upregulated.”
“The mineral content of pulses is generally high, but the bioavailability is poor due to the presence of phytate and polyphenols which inhibits Fe absorption.”