As far as exercise, a study of people
with prediabetes, at Duke University
in Durham, N.C., found that brisk
walking—a total of 7.5 miles per week,
or 1.5 miles per day on 5 days of the
week—was more effective than jogging
in reducing blood sugar. Other research,
at Virginia Tech in Roanoke, found
that resistance training can reduce
blood-sugar levels after meals in people
who have prediabetes.