Having a vegan friend may make it harder for you to choose a weekly brunch spot, but according to a new study, the small vegan population might just have the right idea. Turns out, going vegan could be the key to saving both the planet and millions of lives.

According to researchers at Oxford University, worldwide veganism would also save some $700 billion to $1 trillion per year on health care, and cut food-related emissions by 70 percent. The findings, published in the journal Proceedings of the National Academy of Sciences, mark the first time that researchers have looked into the impact of a worldwide vegan diet on health and climate change.

So the next time you reach for that Quarter Pounder or wolf down that pepperoni pizza, you might want to reconsider — and opt for a falafel instead.