Colonic fermentation after ingestion of fructose-containing sports drink

Background, Many commercially available sports drinks contain 5-6% carbohyd rates, some of which is fructose, However, a number of studies of abdominal complaints have indicated fructose malabsorption, In the present study, we examined colonic fermentation of a fructose-containing sports drink. Methods. Colonic fermentation was determined in normal subjects by measurin g breath hydrogen after ingestion of 350 mi sports drink, cow's milk, or gr een tea with a 200 g rice ball. Results, The incidence of colonic fermentation after ingesting sports drink , milk, and green tea was five (62.5%), six (75%), and none (0%), respectiv ely in eight subjects. Peak increases (ppm) after ingestion of sports drink and milk varied from 0 to 6 (3.1+/-0.9) and 0 to 12 (6.5+/-1.7), respectiv ely. Conclusions. Although the increase of breath hydrogen was not associated wi th abdominal discomfort and its effect on exercise is still unclear, we sug gest avoiding a large ingestion of fructose-containing sports drink before and during exercise.