Dr. David Ma, a professor of human nutrition in the College of Biological Science, spoke with The Washington Post about what constitutes a healthy consumption of caffeine.

“Caffeine is a drug and does have addictive properties,” he cautioned, adding people are drinking larger quantities of coffee and consuming energy drinks quickly.

A professor in the Department of Human Health and Nutritional Sciences, Ma is the director of the Guelph Family Health Study and studies the links between nutrition and cancer.