The correlations between the grain contribution/consumption and the diabetes prevalence in the US. A: The trends in the grain contribution to daily per capita niacin consumption (Ref. ) and in the diabetes prevalence (Ref. ). B: The 26-year lag-regression plot using the data in A. C and D: showing the similar relationships in both sexes. The diabetes data are from Ref. . E: The trends in the per capita grain consumption (Ref. ) and the diabetes prevalence (Ref. ). F: The lag-regression plot of the diabetes prevalence in 1997-2008 against the grain consumption in 1971-1982 using the data in E.