I've had a question for a long time and not bothered to ask it . since ... it perhaps overlaps with the female runner anorexia controversy . I've noticed in a few female distance runners yellowish discoloration of finger nails. I always assumed this Might have been caused by caloric deprivation combined with mileage. Any folks out there know what I'm talking about? Can maybe give a medical explanation too.
Thanks,
-mr curious aka armchair_Med_ted