Modern humans originated in Africa 250,000 years ago. Ancient Africans first migrated northward to reach today’s Middle East, and some of them continued to move eastward to reach the coasts of India and Asia, and eventually the Pacific Islands; some migrated westward, eventually spreading throughout Central Europe; and others continued northward through Central Asia, or, through trials and tribulations, relied on small boats or ice bridges, and finally traveled southward to North America and South America. These migrations may have lasted up to 100,000 years. When humans came to different environments, they were gradually changed by the environment, which led to the formation of different human races and different diseases. For example, Africans are prone to hyperlipidemia; Europeans have a high risk of type I diabetes; Asians can’t drink alcohol. Another example: Japan has a lot of stomach cancer. Because of the sea and mountains, the variety of fruits is small. So, Japanese people eat out of the “stomach cancer”. One is too much salt intake, the second is the lack of vitamin C. So, the National Cancer Center of Japan put forward a diet to prevent stomach cancer 8 recommendations: 1, balanced nutrition; 2, daily dietary changes; 3, but not too much food and alcohol; 4, quit smoking; 5, eat more green and yellow vegetables; 6, eat less salty food; 7, do not eat food burnt off part; 8, eat before, see whether the food is moldy. We and the Japanese are both yellow people and should learn from the Japanese cancer prevention advice to stay away from stomach cancer.