Intestinal-transit and lactose intolerance in chronic alcoholics.

Intestinal transit time of lactulose and malabsorption of lactose were measured by hydrogen excretion in breath following ingestion of 20 g lactulose or 25 g lactose. Patients were 20 recently drinking, adequately nourished, chronic, male alcoholics. Many (65%) complained of diarrhea while drinking actively. Small bowel transit was significantly shorter in alcoholics with diarrhea (62 +/- 8.6 min) than in normal controls (93 +/- 10.4 min, p less than 0.05). It increased significantly after 8-10 days abstinence, to a value of 101.5 +/- 11 min, not significantly different from normal controls. Following lactulose 75% of alcoholics developed diarrhea after 1-2 days compared with only 15% after 8-10 days of abstinence; 40% had diarrhea after lactose in the initial study, whereas no subjects had diarrhea from the same dose after a period of sobriety. These data suggest that drinking alcoholics have an increased sensitivity to osmotic loads, which is associated with diarrhea, shortened transit time, and lactose intolerance. Abnormalities disappeared 8-10 days following cessation of drinking and normal diet.