[3] He subsequently interned on the Osler Service of the Johns Hopkins Hospital in Baltimore, MD, served as a research associate at the National Institutes of Health where his mentor was Robert W. Berliner, M.D., a fellow at the National Institute for Medical Research under mentor Rosalind Pitt-Rivers, Ph.D., and a fellow at New England Medical Center, in Boston, under mentor Edwin (Ted) Astwood, M.D., Ph.D.[3] Bray began his academic career at the Tufts-New England Medical Center, in Boston in 1964.
This work was conducted while in Boston and Los Angeles and focused on clinical and basic scientific studies relating to mechanisms for development of obesity.
After moving to the Pennington Center in 1989 Bray began research which focused mainly on clinical studies.
He has proposed that increasing fructose consumption may be a major contributor to rising rates of obesity.
Bray was one of the investigators who developed the DASH Diet which is now recommended by the Dietary Guidelines and U.S. News & World Report.
Most recently he has explored the consequences of different levels of dietary protein during periods with excess calorie intake.