First, let's break down what alcohol does to you from a biological standpoint. Alcohol has long been demonized as a muscle inhibitor, as it blocks the absorption of nutrients to the parts of your body that need them. When you drink, your body essentially puts all the other foods you’ve consumed on the back-burner, and devotes itself to metabolizing the alcohol first. This is because unlike carbs, protein, and fat, your body isn’t equipped with a storage capacity for alcohol, so when you drink, getting it out of your system is your body’s immediate priority. This process happens rather quickly (unless you’re really hitting the bottle), so this delay of nutrient absorption is actually pretty overblown.
You also may be wondering why some of your friends can drink like Keith Richards and still remain thin. That’s because alcohol has a higher metabolic rate than food, meaning you actually burn more calories processing it than you do anything else.