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But how efficiently are alcohol calories metabolizied? (I think not very)

Depends how regularly someone drinks I think. That's when people may develop a metabolic dependence on alcohol, and withdrawal can be deadly.

I'm pretty sure ultimately, all alcohol must be metabolized. But people who drink more frequently will metabolize more quickly.

I meant how effectively can your body use it as a source of energy. I think the conversion efficiency is much lower than e.g. sugar or fat.