Brittle nails
An under-active thyroid and iron deficiency can cause dry skin and brittle nails. Upping dietary protein and supplementing with biotin can help.
Peeling nails
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This common problem indicates your diet may be lacking conjugated linoleic acid, abundant in vegetable oils.
Spoon-shaped nails
Nails that are slightly raised at the tip and curve down in the middle (the opposite of what they should be) are a sign of iron deficiency or anemia.
