Previously i myself was a bit of a pisspot, its funny how the body adapts and we crave these things.
It used to be work, drink, sleep, work. There was nothing better then getting home and having a drink.
But now I hardly drink at all and if i do its 1-3. Usually even then i get a headache.
If you don't want to change your habits etc i would not think to hard about it, keep drinking and hitting the gym, but if you want to feel better (hard to believe) then stop or cut down a lot.
There can be downsides, as perhaps you may replace your drinking with gambling (whats worse LOL), so try to keep yourself busy. I found the biggest determining factor in my decision was the people that i hang around with.
Bad decisions make the best stories though LOL!