In 10 healthy patients gastric and gallbladder emptying after a standard meal (800 cal, 60% glucides, 20% protides, 20 lipids) associated with 400 ml alkaline bicarbonated water or tap water were evaluated by ultrasonography. An increase of gastric emptying was noted after alkaline bicarbonated water versus tap water with significant differences at 30' (p less than 0.05), 60' (p less than 0.01) and 120' (p less than 0.05). No significant differences exist in final gastric emptying time. Alkaline bicarbonated water induced less intensive gallbladder emptying with statistical difference versus tap water at 60' and 120' from the standard meal (p less than 0.01).