I'm vegan, or 95% vegan I should say. I do it for the environment and animals, rather than for my health, and since everything I've read indicates that going vegan is the best thing you can do for the environment, that's a major selling point for me and makes me feel like I'm doing the best I can. So far I've noticed no particular drawbacks - purchasing groceries and eating out takes more mental effort, but not much since veganism is becoming prevalent now and there are tons more options than just tofu and lettuce! I'll also say that I think it's far more feasible to reduce your intake of meat and animal products than to say "it has to be 100% or nothing." Anybody can try out some vegan/vegetarian dishes a few times a week and see what you think!