Diet and exercise together can help you loose 10-15% of your excess body weight. And you have to maintain the schedule to have sustained effects. Weight regains are the main problems associated with these methods. These methods are useful for over weight persons rather than obese persons.
Bariatric surgeries will help you to loose 60-80% of your excess body weight depends on types of surgeries being done.
Bariatric surgeries will ensure you sustained weight reduction for 10-15 years .
Along with weight surgeries will help you to cure/control your comorbidites like Type 2 dm, hypertension, dyslipidemia etc.
Studies have proven that these surgeries may cure diabetes, helps to control it properly, reduces doses of insulin, helps to get rid of insulins, reduce numbers of medication required to control diabetes.