Which of the following is not an effect of alcohol on the digestive system? a. production of stomach acid increases, which can result in nausea or vomiting. b. excessive amounts of alcohol can cause breathing to slow, become irregular, or stop. c. when alcohol is metabolized in the liver, the chemicals can cause inflammation and scarring. d. alcohol can lead the kidneys to increase urine output, which can lead to dehydration.update: the answer was b.