My body responds better to meat, veggies, fruit, and dairy than it does to anything else. The fresher the better.
I would have no issue giving lab-grown meat a try, with some concern it 'might not work'. A number of 'replacement foods' are so much further divorced from nature than what they're replacing, and somehow, my body seems to recognize the difference and rebel in ways that make me marvel at how many ways your innards can hate the shit out of you (sometimes literally).
I can't do artificial sweeteners, for instance, even naturally derived ones. A few sips of diet soda is a recipe for a vicious headache that will last for several hours. I'd rather go without sugar -- seltzer, black coffee, etc. -- than use a sweetener that isn't sugar. (I don't actually use much sugar, either, and get minimally processed kinds or beverages with cane sugar if I'm going to have them in the house at all.)
Meanwhile, I can eat a pound of bacon a day for a week and I will lose weight, because apparently I am one of those alien experiments that didn't work quite as intended, unless my model of human was bred to make money for Dr. Atkins.