Well, if you have some cheese- or mayonnaise-based nibbles (protein, lipids) with your cocktail, and don’t overdo it, you shouldn’t get drunk. Nothing in excess; all in moderation.
I used to be able to have two or three drinks. Now even one makes me very sleepy and useless, and it takes a long time to metabolize. There was an article in the NYT today that mentions this phenomenon—as you get older you get more and more sensitive to alcohol. Having two drinks is just not going to happen for me, but oh, they’re so delicious!