Likewise, the Women's Health Study found no significant effect of the vitamin on total cancer incidence or cancers of the breast, lung or colon, nor any effect on cancer deaths.
There are no reliable global prevalence figures, but a 2005 study estimated a global incidence of 0.97 per 1000 live births based on research in the United States of America (USA).
While some research suggests that the incidence of childhood obesity may be leveling off, a new study finds that for certain racial groups the rates may actually be getting higher.