Bryce Dallas Howard

She was in Twilight, Spiderman 3, and is another one who fell for an idiot doctor with no nutritional schooling:

“I was a vegan for several years – all the way through my pregnancy and the birth of my son. Becoming Vegan was actually more of a personal choice than a health choice for me, but there were many wonderful health benefits that came along with that lifestyle. Unfortunately, I learned a few months after my son’s birth that I actually had a rare condition that was triggered by pregnancy, where consuming the amino acids from meat became critical to my health. My doctor sat me down and finally said, ‘Bryce, you need to choose between your ethics and your future’,”