A larger stomach volume ensures faster passage to the intestines. The more “pressure” there is on the stomach, the faster the stomach volume passes to the intestines. When small amounts are present in the stomach, there is less pressure on the stomach and the transit time to the intestine is longer. It is precisely for this reason that a sloshing stomach occurs when drinking small sips of liquid. After all, the stomach does not fill up with large amounts of liquid, so the transit time is longer. Once you start running again, the water is still present in the stomach.