All I know is it adds loads of calories, and while breaking down alcohol your liver is less able to break down fat, which accumulates. I'd have to do a websearch for the specifics. But both the above are not something you want.

On the other hand, I really enjoy wine, and beer, and I'll live with the consequences.

Not to be recommended, but alcohol is also a form of doping, especially for sprints towards the end of a long race, be it in cycling (I have read they give mixes of coke and bubbly to teenage racers for sprints) or cross-country skiing (my dad's secret weapon in military competitions when he was young - a beer on the last 5 k. There was no penalty.). It desensitizes a bit and thus makes it easier to go all-out (have noticed myself when riding home after a night out).