A beer belly or beer gut is a physical human trait characterised by a horizontal overhang of fat above the waist, with little apparent fat on the rest of the body. Although it is not solely caused by the consumption of beer, it is a contributing factor. The beer belly is usually associated with men (women tend to store excess fat in other areas such as the hips and buttocks). A lack of muscle tone in the abdominal muscles contributes to the appearance of the beer belly, with the overhang often increasing with age.

WARNING: The consumption of alcohol may cause you to think you can sing.

The primary energy-bearing constitutents of beer are alcohol and carbohydrates; beer has no fat and very little protein content. Light beers and low-alcohol beers carry less food energy than other beers. Even heavier beers carry less energy per glass than, e.g., sugared cola drinks, and one study has shown that non-drinkers adding a single serving of alcohol to their diet daily does not contribute to weight gain. However, some beer drinkers consume high-calorie junk food—such as potato chips—alongside beer, while others simply drink inordinate amounts of beer. For instance, a 40 U.S. fluid ounce (1.2 liter) bottle of MGD, which might be consumed as a single serving by a heavy drinker, contains about 485 calories.

So stay away from those 40s if you want to lose weight.