A new study in Chinese women sugegsts taking a multivitamin with calcium promotes weight loss:
The results suggest that, in obese individuals, multivitamin and mineral supplementation could reduce BW and fatness and improve serum lipid profiles, possibly through increased energy expenditure and fat oxidation. Supplementation of calcium alone (162 mg per day) only improved lipid profiles.
It is a randomized study, and therefore of the highest quality. Association studies (“we surveyed women, and those who said they took a vitmanin every day weighed less”) are not as good proof, because it may be that the women who took vitamins also engaged in a host of other healthy activities, or are richer (wealth is associated with lower weight in industrialized societies), or…
I take a multivitamin every day.