I'm planning to have a bypass later this month. I sing opera, and when I lost a lot of weight in the past I've noticed its affected my singing voice. Has anyone else noticed this?

Only temporarily. If you continue to vocalize bel canto, and specifically focus on breathing and strengthening your diaphragm, you should be fine. It does affect you temporarily but am hang in there. Also, Deborah Voigt had RNY, and continued her brilliant career post op. She talks about it in her book, "Call Me Debbie". It's a great read. Best of luck to you!!

It will kill you in the breathing department at first. But you will have to work through that.

I'm 13 weeks out from surgery today - so far, I've heard zero difference.

Thank you for asking this question. I am considering surgery in a few months, and this was my main concern. How does the procedure, and then the weight loss, effect one's voice for those who sing.