Maybe, but you need to refine your proposal.
I am of the opinion that successful Stacks have broad topic bases. But an even broader base needs to be well-defined. You took an attempt at this but did not succeed, as others have been apt to point out:
Since vegetarian/vegans... have the tendency to fall into naturalist beliefs ("what is natural is good, what is artificial is bad")
Well, that's a stereotype, and really so do a lot of people, like I would actually say everyone falls into those beliefs. We can't really have a forum about any topic related to whether something is artificial or not. That includes topics like all of cooking, fitness, ergonomics, anything regarding human interaction...
So, which food is... "more natural"? Heck no.
- "Are GMOs bad for the environment?" IMO yes this is on topic, because environmental impact of foodstuff (again, in my opinion) on toic.
- "Are GMOs safe?" no, this is not on topic,"safe" is too broad, and this is just about food.
If you want to come up with a more specific proposal that is not based on a dubious stereotype, sure.