2 Drinks Have the Same Effect as 4 Drinks (IMAGE) Washington University School of Medicine Caption Women who had gastric bypass surgery to lose weight saw their blood-alcohol contents rise above the legal limit after only two drinks. Credit Center for Human Nutrition Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.