Is the length of a man's hair related to illness? My family says I can't have long hair since I was a child, or I will get sick. Is it true?/You don't say.

People used to think that hair can absorb human nutrition, which is correct. If your nutrition can't keep up, your hair will become dry and yellow. People who eat well have dark and bright hair, but we can't think that long hair is related to illness, because there are too many factors of illness. The reason why people in my family don't let me have long hair is because boys with long hair will be male, female and male. The old man can't see this. When I was a child, I let my hair grow.