It's my understanding that people who had the weight loss surgery are suppose to limit their intake of carbs and take in more protein. I'm assuming this is something you have (or should) discussed with your doctor and weight loss counselor. Not certain if someone whose had the surgery would do well with something like GU since the body can't absord the sugar naturally.

What would work better maybe something like beef jerky (for protein and salt) or peanut butter (for protein and fats). Your situation is very unique to you cause you have to know what foods your body can and cannot tolerate. Plus I know of a woman who had the surgery and has been hospitalized several times during and after rides because she 1) did not eat properly and 2) did not hydrate properly on rides. Again she wasn't taking in enough proteins and liquids to sustain her riding. She has since modified her diet and is doing better.

Please check with your doctor!