Why do somepeople fingernails and toenals turn to a brown or black color..is it a nutrition thing.?

I alking about the color changes in the fingernails to an old crusty looking nail

Black Nails (Melanonychia) or dark longitudinal streaks
See Nail Abnormality for other longitudinal striations
Medication Side Effects
Cyclophosphamide (Cytoxan)
Excessive Fluoride Supplementation (Fluorosis)
Melanonychia striata
Common in dark skinned persons
Spontaneous or second to trauma or Chemotherapy
Benign Nevus
Uniform brown longitudinal streak localized to nail
Subungual Melanoma
Chronic Renal Failure
Distal nail bed discolored brown

Could be nutritional,you're right -a lack of biotin,zinc or magnesium can all give rise to this.
lt could also be a fungal infection affecting the root of the nail.The nail should be pulled out,and the person should take anti-fungal medication.
Some people (especially dark-skinned negroes or lndians) have a dark brown normal pigmentation in their nails.This has no medical significance.
Some people with chronic liver problems also have dark spots on their faces, palms and nails.

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