I read an article with that topic in Sassy magazine once upon a time. VERY useful information. Since Sassy no longer exists, there's this guy.
"He suggests a scientific approach of spreading out two drinks over the course of a party.
By sipping slowly, you will get just as much of a positive mood effect as slamming drinks one after another, while reducing greatly the letdown once you stop, he said. That's because of something called the "rising phase effect. "
Alcohol lights up the brain's pleasure center, Strang said. So as long as a person's blood-alcohol level is rising, the level of pleasure will, too. But the minute the blood-alcohol level begins to drop, the pleasure level plummets, triggering a craving for more alcohol. This is why people binge drink, he said.
Sipping a drink allows a slow rise in blood-alcohol level and sustained activation of the pleasure center, without reaching levels at which unpleasant side effects occur, Strang said."