How possible is it to lose 200 LBS via RNY? Or should I diet pre-op?

Hi, I'm 6'0" tall and weigh 357 LBS with a BMI of 48. I'm awaiting pre-authorization for the RNY surgery. It seems that you can lose 100-150 Lbs after surgery with disciplne and exercise, but what do you think are my chances of losing 200 LBS? What would be the best way for me to maximize my weight loss? All protein for 12 months? Two hours of exercise per day? OR should I try to lose at least 50 LBS BEFORE surgery and then hope that I could lose the other 150 LBS post-operatively?

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