My sister in law had the sleeve. It really wasn't that different at the outset, other than she could eat slightly more food. But she had all the same issues with discomfort with over-eating and changes in taste and such. Really listening to them talk about it, it seemed like they had exactly the same surgery. One difference between the 2 is that with the sleeve they tend to have more issues with acid reflux than the roux-en-Y, and it is easier to expand out their stomach to accommodate more food over time. So it tends to be slightly less effective and has a slightly greater chance of relapse. Otherwise for them both it has been nearly identical experiences. But her SIL lost about 60-70 pounds total (she's really small to begin with, like 5'4"), and she kept it off for the better part of 5 years but in the last year or two she has put about 40-50 pounds back on. I understand that is somewhat easier to do with the sleeve too.
One difference is with the sleeve they usually completely remove the excess stomach material, while with the roux-en-Y they just bypass it, so it's still there, so the roux-en-Y is reversible while the sleeve is not, if there are complications or other health issues, like dumping syndrome. But these complications tend to be much less with the sleeve.
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