I've been trying to come up with something wise, here, but it's difficult, so let's just simplify things and drop the "Eating meat is bad for your fluteplaying" topic. First of all, it's an opinion, not something provable like "Cutting off your lips is bad for your fluteplaying." To back this up, I am still a meat eater, have never done situps for my breath control, and although never destined to be one of the stars in the sky, I have done quite well enough as a fluteplayer, I think I may be so bold. I've never recorded on flute, but if you want to know, ask any of our Twin Cities-based Chiffers who know my fluteplaying for their opinion. And it may differ from mine, who knows.
I'll be honest, I
am lately veering toward vegetarianism myself, but it's for personal reasons, and definitely not for any tactical approach to supposed better musicianship. Certain people may be thoroughly convinced that abstention from meat is important to one's fluteplaying, but as an opinion, saying it once is enough. I think it's time to move on back to the original topic, now.
"If you take music out of this world, you will have nothing but a ball of fire." - Tribal musician