Knowledge: To have a high level of energy, it is best to work out early in life and eat healthily. On the other hand, eating a lot of black beans will help to get grey hair later in life.

Conversation:
I have brown hair, but it's pretty light. So light that sometimes under the right lighting it looks blond!
The thing is that brown hair does vary from being light brown to an almost black brown.
But what causes a person's hair to change? I know age is a factor but I sort of wish to have a different hair color already.
Apparently melanin levels vary over time, causing the hair color change.
Ok, is that how you get grey hair?
Yes, when you have low level of melanin, you get grey hair.
I did not know that. I really do not want to get grey hair early. Do you know a way to increase melanin levels?

Response: Yeah, I heard eating black beans will help increase melanin, which will limit the chances of getting grey hair.