As far as the ingredients people eat are concerned, people's living standards were very poor in the past, and eating a meal of meat can be said to be a luxury. Nowadays, people even think eating meat is too boring, but many people don't control their diet. Eating big fish and big meat makes their bodies full of greasy, so many people are ill because of the three highs, and their physical fitness will definitely not be good.
When people have no money, they only eat coarse grains every day. For example, Wowotou in my province and city is what people often eat when they are poor. There are not many people who like to eat now, and those who are really rich are enjoying coarse grains again. They think that Wowotou is a representative of health, and may think so only when the living standard reaches a certain level.
We must ensure health and hygiene. Now people have a deeper understanding of hygiene and want to have a better life. Now people have a good habit of washing their hands before and after meals.
I believe that with the improvement of people's living habits and health level, if people want to live a long and healthy life, it will not be a problem, and they will live healthier and more relaxed.