Will not stop the pints either way, but does beer really causes 'beer belly'?
Please provide links/research.
It's to do with hormones, and not specifically beer but the fact that it's high in carbohydrates. As the blood sugar increases, the body produces more insulin to push the blood sugar into the cells and thus decrease the overall blood sugar level. But elevated insulin levels in men cases testosterone to be converted into estrogens, which is the cause of the beer belly (and sometimes accompanying man-boobs.) Testosterone is also converted into DHT, which is linked with prostate cancer and hair loss.
Beer is an energy dense food, and if you take more energy in than your body metabolizes out you'll gain weight. If your body uses more energy than you take in, on the other hand, you'll lose weight.
I've seen arguments made that there is something very particular about beer that causes me to develop fat around the midsection, but the science is usually relatively soft. The much simpler explanation is just: beer = calories, excess calories = weight gain. Because beer doesn't always feel like a hunger-bound food in the way that, say, a cheeseburger does, however, it's sometimes easier to pick up piles of unexpected calories from beer than other sources.