If you listen to the popular press, you would think that every weight-loss patient has a complication or dies after weight loss surgery. The truth of the matter is that the majority of people come through their operation with few to no complications.
It is important to understand, however, that there are real risks when undergoing a major operation like weight-loss surgery.
Despite what the media would have you believe, death is actually unusual after weight-loss surgery. Even if the risk of death is very low, it is very real and must be seriously considered when contemplating weight-loss surgery. With any major surgery there are risks while you are in the hospital and after you have gone home.
On a more positive note, there are some things that you can do before your operation to minimize your risk. First of all you have to look for an experienced weight loss surgeon and if you are a smoker you have to quit smoking immediately!
In severely obese individuals, surgery resulted in a weight loss of 45 to 65 pounds, which was maintained up to ten years.Surgery is associated with improvements in some obesity-related conditions such as hypertension, diabetes, elevated cholesterol, and sleep apnea.So, the most important thing is to be really sure that you need a surgery, and if you do need; when considering the risks of weight-loss surgery, you must consider the risks of not having weight-loss surgery.  
Finally there are two main reasons why we consider weight loss surgery. The first is that other methods for controlling weight have not been effective, and the second is that obesity has serious consequences for health. In general, the more severe obesity is , the more severe are  the consequences.