What study suggested that unabsorbed dietary iron is the cause of colorectal cancer?

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Another study supports these findings from Kato of unabsorbed dietary iron and a possible association with colorectal cancer. The study included 18 healthy volunteers who supplemented their diet with 100mg of iron sulfate. The subjects documented their food intake and samples of feces were taken in advance, during and after the two weeks of supplementation. The results showed that levels of iron in the faeces significantly increased during the two weeks of supplementation and restored to starting levels after the supplementation stopped. The concentration of weakly bound iron started at 60...
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