Any vegans or vegetarians

Have you checked out the Happy Herbivores group? It's only moderately active, but there's lots of good content there.

https://community.myfitnesspal.com/en/group/45-happy-herbivores

I've been vegetarian for 46+ years, but not vegan (ovo-lacto veg, in fact), and not especially a strong advocate here on MFP. I feel like vegetarianism/veganism is a rational choice for a person who has some type of ethical reason, but I don't consider it to be inherently healthier or better for weight loss.

There are IMO quite a few advocacy web sites with a too-loose relationship with science, but have found this one useful for sound evidence-based advice about nutrition on plant-based/vegan diets:

https://veganhealth.org/