It’s the beef in your stew and the fish in your tacos; the eggs in your omelet and the beans on your nachos. Protein-rich foods play a starring role in any satisfying meal. And for good reason: Protein is essential for every function in your body.

But how much protein do you really need? What are the best food sources? And how can you be sure you’re getting enough?

Take this quiz to see how much you know.