In an interview with the Well section of The New York Times, David Ludwig often uses an analogy when he talks about weight loss: Human beings are not toaster ovens. Dr. Ludwig, an obesity expert and professor of nutrition at the Harvard T.H. Chan School of Public Health, argues that weight gain begins when people eat the wrong types of food, which throws their hormones out of whack and sets off a cycle of cravings, hunger and bingeing.

In his new book, “Always Hungry?” he argues that the primary driver of obesity today is not an excess of calories per se, but an excess of high glycemic foods like sugar, refined grains and other processed carbohydrates.

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