Any protein can be eaten at any meal, so 6 oz. of beans at breakfast is fine. In addition, having any protein from the lunch or dinner column for breakfast is okay. So, 6 oz. of beans or 4 oz. of tofu/tempeh are perfectly wonderful breakfast options. It goes the other way too—breakfast proteins can be eaten for lunch or dinner. We only separate them into the “Breakfast” and “Lunch/Dinner” categories to help people with meal planning.