Guinness Draught Stout is the original nitrogen-infused beer. Although to the uninitiated, it can look dark and heavy, it actually tastes deliciously light and smooth, swirling with notes of roasted barley, caramel, coffee and chocolate. The net result is a flavorful stout that’s as approachable as a lager — which it has long been one of the world’s great pub beers. Another surprise is its low-calorie count, just 126 calories for a 12-ounce serve. That’s just 15 calories less than a typical light beer.