To avoid drunk driving and lower your blood alcohol content(BAC) eat before drinking.

When alcohol enters an empty stomach, about 20 percent of it will make its way directly through the stomach walls. The remaining 80- percent will pass through the base of the stomach and enter into the small intestine, from which it is readily absorbed into the blood. Because the body doesn't need to digest the alcohol before admitting it into the blood stream, the small intestine will be open to the alcohol as soon as it hits the stomach.

But if here is food in the stomach it will affect the absorption of alcohol.

Food has to be partially digested in the stomach before it can pass to the small intestine. when the brain senses that food is in the stomach, it commands a muscle at the base of the stomach to constrict, and cut off passage to the small intestine. The muscle is called the pylorus,or pyloric valve. As long as it remains constricted nothing will move out of the stomach and into the small intestine. If the alcohol is ins the stomach along with the food, the alcohol; will also be trapped behind the pylorus and some of the alcohol will begin to break down even before it ever gets into the blood. The overall effect is to significantly slow the absorption of alcohol into the blood.