The lap band can't be done on some people. My sisters were 2 cases of that. BOTH were diabetic and over 400 pounds. They needed to lose the weight ASAP. Also, you can't eat through the RnY. Both sisters, again, tried and ended up in the ER every time. Now my older sister is pregnant and can't even eat enough for her and the baby. I have to shave her head every weekend because she's losing hair due to malnourishment. She doesn't get sick from eating too much, she physically can't. Even liquids. She was in the ER last night for dehydration and false labor due to dehydration because she literally can't eat and drink enough even though she desperately wants to and needs to.
Well I certainly don't want to turn this into a debate on which surgery is better, however I have 3 friends right now who got the RnY and would beg to differ with you about eating through it. Two do not have any "dumping syndrome" at all if they eat high sugar items, not all patients get sick or suffer any ill effects. One gets the dumping syndrome, but not to the extent to really dissuade her bad habit. The problems you mention, regarding malnourishen is the other reason I chose not to go the RnY route. That is not an issue with lap band. Although every surgery has its risks, lap band is far less risky than RnY. But whatever you chose to do OP, do your own research. Google both surgeries, weigh the risks and results for yourself. It's true that lap band AND RnY are not for everyone, and it is a HIGHLY personal decision. I lost 130 lbs in 18 mos. So, lap band also provides a quicker loss. But again, it is strictly between the patient and doctor to decide which is best for each individual.
On a side note, for people who are suggesting merely eating right and exercising will fix the problem, for some people, this is not reasonable. At some point, morbidly obese people cannot exercise enough, or are even able to, to make a difference. Getting surgery, for most of us, is a last ditch effort to save our lives. Perhaps early on in our destructive behavior, this would have been productive advise, however, as there are MANY underlying issues as to why we overeat, and/or eat the wrong things, this is not a cure all. Please try not to judge until you walk a mile in our shoes.