Each gram of alcohol contains 7.1 calories, which is second only to fat in calorie density per gram - protein and carbohydrates each contain 4 calories per gram. An average beer has around 130 to 150 calories. Drink five of these, and you're already up at 750 calories. If you drank one beer a day, that would be an extra 1050 calories that you consume each week. It can quickly add up.
Weight loss and weight gain is dictated by one simple factor - calorie surplus or calorie deficit. If you are consuming more calories than you burn, there is only one place for the extra calories to go - stored as body fat as a long term energy source. By drinking beer and alcohol, you directly add more calories to your diet, and increase your calorie intake, which contributes to weight gain.
Alcohol consumption on waist size in French men and women was analyzed in another study. 3500 French men and women were randomly selected, and alcohol consumption was assessed with a quantitative frequency questionnaire. Their results found that weekly alcohol consumption ranged from 0 to 1655ml, and wine was the main source of alcohol, representing 67% of total alcohol consumed. They found that total alcohol consumption was positively associated with waist-to-hip ratio and waist girth independent of BMI for both men and women. They concluded that alcohol consumption is associated with greater waist to hip ratio independent of BMI.  The moral of this study is that the more alcohol you consume, the larger your waist will be.
How to Lose Beer Bellies
So, you have a beer belly, and you want to do something about it. How do you get rid of your beer belly? First of all, you can't spot reduce - meaning there is nothing you can do to specifically target the belly fat. To lose the beer gut, you have to reduce your overall body fat, and this is most effectively accomplish through three aspects:
- Diet and nutrition
- Weight lifting program
- Cardio training
As mentioned above, each gram of alcohol has about 7 calories. So one of the first things you need to do is limit your alcohol consumption, and this will help reduce your overall calorie intake. Weight gain and loss is dictated by whether you have a calorie surplus or deficit. To lose weight and fat, your diet needs to create a calorie deficit. See here for more on dieting to lose tummy fat.
One of the most effective, yet overlooked methods for losing fat is to simply build muscle. By adding lean muscle mass, you effectively increase your body's energy expenditure and burn more calories naturally. Not only does increasing muscle mass burn more fat, but the process (the workout) with which you use to build muscle (weight lifting) also works as an excellent method to burn extra calories and studies have found that performing intense weight lifting sessions work to stimulate energy expenditure and lipid oxidation for prolonged periods even after your workout is completed.  With intense physical exercise, your energy expenditure at resting pace also increases - meaning that you naturally burn more calories even at rest simply by performing intense exercises. See here for more on exercises to get rid of belly fat.
Finally, cardio training - another essential to any successful weight loss program. Like weight lifting, the benefits are twofold: 1) you burn extra calories during the cardio training, and 2) with high intensity cardio training, your metabolism is elevated for hours after you've completed your training. As mentioned above, intense training sessions works best to increase your metabolism. While doing slow or moderate cardio for long periods burn more calories during the cardio session, it does little to increase your energy expenditure after you're done. However, high intensity cardio session may burn less calories because the training sessions are shorter, but they work to increase your metabolism for hours even after you've finished. More on cardio training to reduce stomach fat here.
When trying to lose a beer belly, keep in mind that the fat around your mid section didn't get there over-night - it took months, if not years of bad eating and drinking habits, and therefore, don't expect to be able to undo the months and years of damage over a few short weeks. Fat loss is a long process that requires motivation and determination. You must set realistic goals that you can achieve rather than lofty goals that you ultimately fail at and cause you to give up. Tom Venuto's Burn the Fat program shows you the real fat loss methods that can help you succeed at reducing your beer belly and losing overall body fat. Please see below: