Surgery may appear to be a magic bullet for you if you are battling weight issues.
 It is only a lifeline and the cost is a lot of personal work and commitment to lifelong dietary and lifestyle changes, as well as the psychological adaption to those changes.
 Keeping weight off through food quantity and quality, and exercise, is essential in order to prevent a return of insulin resistance which leads to type 2 diabetes.
In Australia, approximately 95 per cent of weight-loss surgery involves gastric banding.
 In the US gastric bypass is favored; surgeons prefer this surgery as they believe it to be safer and has fewer complications.
Gastric Banding:

• the procedure is performed using keyhole surgery
• a band is placed around the stomach to make it into a smaller pouch
• when you eat, you feel full quickly and can only tolerate small amounts of food

Pros:

• is a simple procedure
• has a lower complication rate when compared with more involved procedures
• the band can be adjusted
• when you have reached your ideal weight the band can be removed 

Cons:  

• causes less weight loss at a slower rate 
• isn't recommended for people who have Crohn's disease, hiatus hernia or gastric ulcers
• prolapse of the stomach could occur requiring replacement of the band
• the band could erode into the stomach wall.
   The band would then be replaced
• previously undiagnosed gall stones could become active

Gastric Bypass Surgery:

• some surgeons perform this operation by using a laparoscope inserted through small incisions in the abdomen
• a tiny camera on the tip of the laparoscope allows the surgeon to see inside to the abdominal cavity
• compared to open gastric bypass, the laparoscopic procedure usually leads to a faster recovery
• the surgeon creates a small pouch at the top of your stomach and adds a bypass around a section of your stomach and small intestine.
  This enables food to be redirected to a lower section of your small intestine, limiting your ability to absorb calories.
  

Pros:

• the usual weight loss within the first two years post operative, is between 50 to 60 per cent of your excess weight
• bypass surgery may improve or resolve type 2 diabetes, high blood pressure, and high cholesterol levels    
• this surgery has also improved mobility and  quality of life for those who are severely obese

Cons:        

• you may experience any of these symptoms as your body reacts to rapid weight loss in the first 6 months:  mood changes, hair thinning, dry skin, feeling tired and body aches
• the pouch may stretch
• vitamin and mineral deficiency (lack of absorption of iron, vitamin B12, calcium and Vitamin D)
• intolerance of certain foods
• "dumping syndrome" may occur.
   This is where food moves too quickly through the digestive system.
   It can be relieved by lying down following eating

If you have been diagnosed with type 2 diabetes and are severely overweight talk to your health care provider.
 It is important that people try other ways of losing weight first.