Boots, I want to say that you ask your questions and I love it. I cant help with all of them but some I can.
They have to go near the liver to get to the stomach. The last thing they want to do is nick it or one of the blood vessels. In overwieght patients it seems to be bigger. I have what they call a fatty liver. The surgery will help with that because it will come back to normal after I lose weight.
This link here is the best one I have found to detail it out. It will tell you how important weight loss is when you have a fatty liver.
Fatty Liver. Now my Dr dont require a diet before hand however he did ask me on the last appoitment to drop 10 pounds in the 3 months I had before surgery.
All in all..........It makes it much easier for the Dr to do the surgery than to have to move it around alot to get to it. Its safer.