Also your body will put any fat burning on hold when you drink. Alcohol is a much easier substance to turn to keotenes then fat is. While you have alcohol your liver will process those keotenes and leave the fat alone. What you eat at this time will be stored as fat for later use, possibly around your liver. There is also the problem you mentioned of stopping after just one, and will power is also lowered so it's harder to stay on plan.

Alcohol in moderation can be fine, as mentioned some have health benifits. Large amounts of alcohol, or regular drinking cna lead to liver problems from that fat build up, as well as never really burning fat. With beer there is a high GI sugar, and no nutritional benifits. With red or white wine there can be a smaller amount of carbs (the dry wines) and possible health benifits.

I think one thing SB and all LC diets start making you look at is what is in food, not just what it's lacking. Fat free or carb free doesn't mean healthy, it's what nutrients are available in relation to the carb or fat amounts. That's why veggies and berroes are always a good bet, lots of nutrients with a smaller amount of carbs.