RNY is a relative safe procedure, and very effective.
As far as eating your doctor will most likely tell you eat protein first then fruits/vegis, then carbs.
Is there risk of course, but it is not as risky as staying overweight.
It is just a tool not a miracle.
The actual risk is about 1%, however compared to being morbidly obese the risk is low.
I know people who have had banding and surgical reducing the stomach size, both over five years have lost he same weight but the banding takes longer.
One thing you will find is that most people giving you advice know nothing to little of the procedure except what they read, for some reason there is an anti surgery approach to weight loss.
This surgery has helped thousands of people live longer and healthier lives.
God’s speed.