Why is there nothing to eat at home?

Rough tea and light rice support people. People eat a lot of flour and rice and precious ingredients, but people's health is not much less than before. Compared with the diet of their parents when they were young, the food they ate was more delicate and very nutritious. However, our system is not as good as our parents' physique. Because my parents have been living on bread for a long time. Physical fitness is better than ours. When my parents were young, because of the famine in our country, many people ate only sweet potatoes or corn instead of white flour.