1. What can supplement protein for breakfast? In addition to milk and eggs, there are soybean milk, tofu, mixed meals, rice porridge, millet porridge, corn porridge, lotus root starch and so on. 2. Some people don't eat breakfast for a long time, which leads to nephrolithiasis or hepatolithiasis. Three meals a day should be done: eat well early, eat well in the middle, eat less in the evening, and eat well early. Personal opinion, for reference only, I wish you good health and smooth work!