In the long process of evolution, food scarcity has always been the primary threat faced by mankind. Due to the uncertainty of food supply and the inability of food to be preserved for a long time, mankind has been living a full and hungry life. Individuals who can make the most effective use of food have survival advantages. After repeated famine choices, individuals with survival advantages and their genes, These genes can stimulate the secretion of a large amount of insulin after a full meal, so as to maximize the conversion and utilization of glucose in the blood. Although the cost of doing so may lead to obesity, the threat to survival caused by its harm to the body will not appear until middle age. For most of human history, The average life expectancy is less than 30 years.
The paragraph is intended to illustrate that obesity is related to the dominant genes of human survival and reproduction.