Nails: Fingernails
Look at your fingernails. Do they have lines and hard lines, like ridges?
This is a sluggish thyroid.
Thus it can mean slow metabolism.
Ask your professional doctor to evaluate you, by doing blood tests.
Good Luck
Do your fingernails look white?
This could mean reduced circulation, liver toxins.
Ask your professional doctor to evaluate you, by doing liver functions blood tests.