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If you're training other muscles and you think you're exercising your core, you're training the wrong muscles. The 5 true core muscles are the only ones that really matter when it comes to training your abs for a flat stomach.
Being made of muscles, it is easily stretchable. So although normally, a feeling of fullness would set in on consuming about one liter of food ( Well, for most people ;)), the stomach can hold a lot more than that because of it's elasticity. Normally- About 1.5- 2 liters. Maximum capacity- 3-4 liters.