Because many delicious things are human necessities that are hard to eat in the evil old society, natural selection makes people crazy about these things. For example, fat and sugar are high-quality energy, meat is high-quality protein, barbecue and frying represent killing parasites, and salt is the factor that produces bioelectricity. In the era of lack of nutrition, these things are not easy to get, and less intake can save lives, so people will like this food very much. But in the past, the human body did not have the conditions to eat these foods in large quantities, so there was no preventive mechanism for the physiological problems caused by large intake. For example, Polynesians are a maritime people, and they often encounter the problem of food shortage during sailing, so they have a high tolerance for nutritional deficiency of fat and sugar, and prefer to eat foods with high sugar and oil. Even Tonga's mate selection is based on fat people with energy storage. However, once their food is rich, such as Nauru, which made its fortune from bird droppings, a large number of high-energy foods are in sufficient supply, and the result is the outbreak of "three high" diseases. Crude fiber plant foods are abundant first, so natural selection does not make people greedy for these foods, but these foods were once people's staple foods. Therefore, people's bodies often adapt to them. For example, they don't need to synthesize vitamins or essential amino acids, and the length of their intestines is much longer than that of other carnivores, and so on. Because Eskimos' staple food is meat, they won't get scurvy because they don't eat plant food, and their intestines are short to reduce the time they stay in the intestines when meat is digested and avoid rectal cancer. Therefore, under the condition of abundant materials, human beings still stay in the old society because of their food preference, but the food structure has entered a new society, so food shortage becomes food excess, which exceeds the intake of human beings and becomes unhealthy food.
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