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If you jumped of a step with a large inflated balloon held by the neck between your finger and thumb, you would not drop it because it's not heavy.

If you filled the balloon with water and repeated the procedure, the balloon would likely pull free from your hand because the water inside it exerts a downward force when you land.

This is what happens to your stomach if it has a weight of water in it, the jolt of landing gently pulls the stomach back into the abdomen, where it belongs.

Also the abdominal contents will be inclined to move downwards and make room for the stomach.

I have read your articles for about 5 years now Dr Kim.
always enjoying and trusting them, this one is a fine example.

Your commitment to being a sincere and free spirit in the medical world makes your newsletters a pleasure to read for us ordinary people. Thanks for all your help in the past,long may you continue.