Strong and beatuful hair is also a sign of health (natural hair color).
Strong and beatuful fingernails are also a sign of halth.
Beautiful and healty skin is also a sign of health.
Good smell of skin and good smell of sweat is also a sign of health.
White and healthy teeth are also a sign of health.
White, sincere and beautiful smile is also a sign of health, good mental health.
That is how we naturally advertise to opposite sex that we are healthy, and that we can heave healthy offspring.
All those things make someone attractive.
Once you loose nail half-moons, it is your body telling you you are not doing the things right.
In old times, people would have nail half-moons even 80 years old.
Some 80 years old stil keep their natural hair color.
Things that can cause serious health damage and it may result in the loss of half-moons are use of antibioics, steroids and many other medications, and poor diet, lack of sleep, excessive self-gratification, poor lifestyle habits.
WS