Dr. Flack joined the department of Dietetics and Human nutrition in the fall of 2017 after spending three years at the USDA Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota. His research centers on obesity prevention / treatment utilizing randomized controlled trials focusing on nutrition and exercise interventions that improve psychological health and the adoption of long term healthy habits.  Dr. Flack studies ways exercise can impact dietary behaviors with the goal of improving the effectiveness of exercise for weight loss and weight loss maintenance. Dr. Flack is also interested in behavioral reinforcement in the context of eating and exercise behaviors as a means to sustain behavioral change.  He has led interventions that have aimed at increasing the reinforcing value of exercise and physical activity behaviors, how the reinforcing value of foods can be altered, and how individuals compensate for energy expended during exercise.