nails tell alot about a person. i think you might want to go to see a doctor for a checkup.
ridges could be telling you that you that your thyroid may be a little off or your cholestrol isn't at the numbers it should be. i don't really know what the white lines suggest but i would get a medical checkup. i don't know how old you are or even where you are from. i don't mean to scare you, i just think a check up is in order.