TCF7L2 and type 2 diabetes mellitus: Contrary, persons with the rs7903146 risk T‐allele showed a slight trend for increased T2D risk with increasing cereal fiber intake in SDPP 20 and with increasing fiber intake in MDCS.21, 22 An interaction of whole grain with TCF7L2 rs7903146 was also reported by SDPP20 and EPIC‐Potsdam.19 In line with the fiber findings, higher whole‐grain intake was in both studies19, 20 associated with lower T2D incidence among persons with the rs7903146 CC‐genotype, but not among persons with the risk T‐allele.