Pipulla gave you the same verse I was going to. Personally, I have unintionally worshipped food for far too long. I have thought about every meal, obsessed over the scale, perused recipes, wasted $$ on failed diets, read books, and on and on and on with food, more so than my God. I have been deeply convicted of this. My heart has been more focused on food and my weight for years. It's like a love affair - I think about my weight and my size all the time, I plan my next diet just to fail at it and feel badly about myself. Food, and diets are my idol. If I have a good day with my diet than I feel good about myself. If I have a bad day with it, then bad about myself. I have gotten my self esteem more from my wieght than from God for years. This is not how He wants us to live nor where he wants us to gain our identity from. Food and my obsession with it and my weight is the biggest sin in my life. God commands that we love Him first and have no idols before him, and if something causes us to sin, we are to flee from it. Or as Pipulla stated, if our right eye causes us to sin, we are to cut it out. I believe that this surgery will help me get rid of this idol. I will no longer be distracted by food. I will eat to live, not live to eat. God intended food to be sustinance for life, not the center of all enjoyment. I have had total peace since I decided to have this surgery. I personally feel that I am doing in obediance to Him.
Now that said, that's me. If you DON'T have a peace about it, or if this surgery will cause you to obsess more, than carefully consider if it is God's will for you. I totally appreciate your friends thought process and where she is coming from, but she probably doesn't understand the sin and idol that food is in your life. God bless.