They cut the top part of your stomach off (a small section) and make you a new stomach called the pouch (the size of a egg) and attach the small intestine to the bottom of the pouch. That becomes your new stomach. You can only eat small amounts of food, less intake you lose weight. As MJ said it almost always cures people who are diabetics and most of the time reduces blood pressure and heart problems unless a lot of damage has already occurred.
The drawbacks are because the food doesn't travel down the large intestine your body (small intestine) doesnot absorb as many nutrients out of the food, so you have to take vitamins (MJ they make specialty vitamins just for gasric bypass) also MJ you will need to take shots/oral iron supplements (this is very critical). All in all it really works for people who have trouble losing weight and keeping it off.
I don't regret having mine done.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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