Eggs are one of the most nutritious and affordable foods you can buy. They’re packed full of protein and essential nutrients. However when you walk through the refrigerated section of your grocery store, it can get confusing. You have to decide: Do I buy the brown ones? The white ones? The cheapest ones? The organic ones? Oh, wait, what about the cage-free ones? How can you tell what’s the most sustainable—what hens were treated the most humanely? With all the labels that are placed on cartons, it’s difficult to discern which ones are worth buying. To start, you should know that aside from “certified organic,” the USDA does not set any definitions or requirements for labels on egg cartons. Here’s what you need to know to be a savvier shopper.