People lose a lot of weight on beer only fasts… there is also a long history of trappist monks doing beer only fasts for religious reasons, and presumably losing a lot of weight.

My understanding is they are usually using high carb low alcohol beer, so it’s more of a liquid only low fat diet than an alcohol diet.

Alcohol is a vasodilator so maybe you'd lose more heat that way.

Vomiting won’t retain calories which happens when you are “spectacularly drunk”.

Someone is clearly not an experienced drunk (joke, joke)

Appoximately 7 kcal per gramm vs 4 kcal per gramm for sugar