Journal of the American Medical Association

Andy Teo (Flickr)

Gun deaths worldwide total about 250,000 yearly and the United States is among just six countries that make up half of those fatalities, a study found.

Researchers say the daily use of multivitamins and minerals may significantly delay progression of HIV, if given during the early stages of infection.  The study, led by a Florida International University professor and published Tuesday in the Journal of the American Medical Association, followed 878 HIV-infected patients in Botswana over a two-year period, the Miami Herald reports.

A multi-year study finds that Americans -- and Floridians -- are exercising more than in the past, yet still getting fatter. In a similar vein, we're living longer, but the extra years aren't healthy ones.

Those seemingly contradictory results, which show public health is a complicated business, emerge from a sweeping 25-year study of the nation's health published this week in the Journal of the American Medical Association. The analysis was done by Institute for Health Metrics and Evaluation at the University of Washington in Seattle.