In the third installment of Dr. Robert Lustig’s, The Skinny On Obesity series, Dr. Lustig covers how our consumption of carbohydrate rich diets influence the roles of insulin and leptin hormones in our bodies, and how these contribute to obesity.

This directly addresses the misleading (and dangerous) notion that “a calorie is a calorie.” It turns (and this is no surprise to anyone who pays attention to nutrition research, really) out that different types of calories trigger different responses in the body’s hormonal response.