Half-doses of the diabetes meds Avandia and metformin may help prevent pre-diabetes from turning into diabetes, Canadian researchers say. Fourteen percent of study participants given the low doses developed diabetes after four years, compared to 39 percent of people given placebo. The study, funded by Avandia's drugmaker, also found that the combination of drugs did not cause the common side effects such as weight gain, fluid retention, and GI upset. The study did not study patients long enough...