Carol J. Adams at the Washington Post:

Nutritionists agree that adults who consume about 2,000 calories per day should get about 50 grams of protein. What’s a vegan to do? Well, a half-cup of chickpeas contains 6 grams of protein. A half-cup of firm tofu contains 20 grams. A veggie burger has about 15 grams. We can get to 50 grams pretty quickly without meatloaf or bacon.