The correlations between the niacin consumption and the obesity prevalence in US adults. A: Trends of prevalence of obesity and diabetes in the US. B: The trends in the per capita niacin consumption (Ref. ) and in the obesity prevalence (Ref. ). The 10-year lag regression result is presented in the panel. C and D: showing the similar associations in both sexes. The obesity prevalence data are derived from Ref. . The lag regression results are presented in each panel.