Chocolate chip cookies. Buttery popcorn. Chips and dip. Snacking is an American pastime. Indeed, Time.com has called us “a nation of committed Twinkie eaters,” while the Centers for Disease Control and Prevention have announced that the obesity rate is at an all-time high. Sixty-one percent of American adults are overweight or obese, a condition linked to heart attacks, strokes, diabetes and some cancers, which kill 300,000 a year.