Unfortunately, there is no surgery that will magically help you to curb you affliction for carbs. The RNY may potentially cause dumping if you overindulge in carbs, but only about 30% of RNYers experience dumping long term, so I wouldn't bank on that. Some DSers experience gas and bloating from overindulging in certain types of carbs, but again, not all of them experience this. Some people experience a reduction in overall appetite and certainly in cravings after WLS, but it's highly individual.
With 80 pounds to lose, I might typically suggest the VSG, as lightweights tend to do very well with it, but with lack of exercise ability also being a factor, I still suggest the DS, as it is the most "forgiving" (calorie-wise) due to the greater amount of malabsorption.
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