“”Although seasonal weight gain varies from person to person, there have been surveys that show an average of a five to seven pound gain in weight in winter,” says Lawrence J. Cheskin, MD, founder and director of the Johns Hopkins.  Setting a regular fitness schedule is the key to keeping weight off in winter,” says Lisa Giannetto, MD, an assistant clinical professor in the Diet and Fitness Center at the Duke University Medical Center in Durham, N.C.”

Web M.D.