Hi. I know how hard it can be to lose weight. Personally, I feel it is one of the toughest challenges for anyone. I hope you have tried a balanced diet and an exercise regimen before thinking of surgery. Any surgery will have its inherent side effects and can cause problems. You would also need to adapt to a lot of lifestyle changes after surgery. There can be slight pain, formation of gallstones among other problems. You must control the types of food you eat and certain surgeries require you to use dietary supplements for the rest of your life. So, you must be absolutely sure before you decide to go for a weight loss surgery.
Sometimes, you will have no choice but to undergo surgery. If you have tried various diet and exercises without much success, and have any existing illness because of your excess weight (such as Type 2 diabetes mellitus or increased blood pressure, or episodes of sudden breathlessness during sleep), then you will require the surgery to alleviate or at least reduce the severity of those problems.
If you are not completely convinced that you need a surgery, you might want to choose what is called Adjustable Gastric Banding. In case after this procedure, you feel uncomfortable and want to go back, then it is possible. This procedure is reversible. All it does is that a band squeezes your stomach to make it small and makes the food stay in longer so that you eat less and feel hungry less often.
If you are looking for more permanent solutions, then you could consider Gastric Sleeve. Here a part of your stomach is cut and permanently removed. So basically, your stomach can't hold lots of food and you eat less.
The other two procedures currently in use are called Gastric Bypass (Roux-en-Y) and Biliopancreatic diversion with a duodenal switch. These procedures make your intestines absorb less calories and nutrients in addition to making your stomach small. In effect, you eat less and of what you eat, even lesser amount of food gets absorbed.
However they make a few of structural rearrangements, which translates to having more complications than the other procedures. On the flip side however, you will notice comparatively more weight loss than the others. Another thing you must remember is that you will have to depend on dietary supplements for the rest of your life if you undergo these procedures.
In summary, any of these procedures will be effective in reducing your excess weight by more than 50% at least in 12 to 24 months. Choose an experienced surgeon who works in a high volume setup and has expertise on bariatric principles to ensure you have the least risk of surgical complications like bleeding, leakage and failure of procedure. Stay motivated and adapt to necessary changes and you will be successful.