It's not that is swells it's just the normal reaction for your digestive system. The more food you put in your stomach the more room it'll make. You're stomach will continue to expand (swell) until you get the right amount of food limit into your pouch. You can also train your stomach to expand more by eating just a tad bit more daily.
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Well you can't expect for your belly to get bigger after eating a grape for example, but if you eat enough of something (epsecially to the point of being full) your belly will get bigger but that's just because their is food in your stomach. The food takes up space that's why there is also a limit to how much you can eat.
because it is expanding to fit all of the food you stuffed ino it. And it can only hold 4 liters. so if you eat of drink that or close to that your stoamch will get very big.