People often say that black is a healthy color. Is it true that the darker the healthier?

If you are not born black, turning black in a short time is not necessarily a good phenomenon. There is a saying in Chinese medicine that people with kidney deficiency have a "black face", so black is not necessarily a healthy color. Suntan is another matter, but it should not be overdone. When things go to extremes, the other way around. You can master the scale of everything.