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Choline, One-Carbon Metabolism, and Colorectal Adenoma
One-carbon metabolism is a network of biochemical pathways that plays a central role in the synthesis, repair, and modification of DNA and may therefore have a role in carcinogenesis. Epidemiologic studies have suggested that decreased intake of folate and methionine and increased intake of alcohol—all dietary factors involved in one-carbon metabolism—are associated with an increased risk of colorectal adenoma, a precursor of colorectal cancer. Choline and betaine also are important factors in one-carbon metabolism, but their effect on colorectal adenoma risk was not known. Cho et al. (p. 1224) assessed
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