Drinking beer increases bowel movements because there is an excess of alcohol and sugar, which causes increased bowel movements as well as diarrhea, reports the International Foundation for Functional Gastrointestinal Disorders. There are other consequences from drinking too much beer, including liver damage, alcohol birth defects when pregnant, pancreatic cancer, heart disease and poor organ health.
Increased bowel movements tend to lead to chronic diarrhea, which can be caused by excessive drinking, excessive sugar intake, excessive caffeine intake, herbal medicinal laxatives, drinking milk when lactose intolerant or having a food allergy that leads to diarrhea, reports the International Foundation for Functional Gastrointestinal Disorders. Diarrhea management may involve medication as well as potential surgery.
Those experiencing chronic diarrhea or increased bowel movements after drinking should stop drinking alcohol until the problem is resolved. Once the patient feels better, alcohol consumption can slowly be consumed in small increments. When it comes to alcohol consumption, doctors recommend that men drink no more than three or four drinks per day and women drink no more than one to two drinks per day. Anything more than this amount is likely to cause increased bowel movements and other negative side effects, writes the University of Iowa.