Tongue Signal: If the tongue is overly smooth, the taste buds are red and raised, or the sides of the tip of the tongue are yellow or white, it indicates a deficiency in folic acid and iron.
Oral Signal: If the corners of the mouth are red, chronically cracked, and the lips and tongue are painful, it may be angular stomatitis caused by malnutrition. This is mostly caused by a deficiency in iron, Vitamin B2, and Vitamin B6.
Lip Signal: Cracked lips and a blurred lip line are signs of lip problems, indicating a deficiency in Vitamin B2 and Vitamin C.
Tongue Signal: If the tongue is overly smooth, the taste buds are red and raised, or the sides of the tip of the tongue are yellow or white, it indicates a deficiency in folic acid and iron.
Nasal Signal: If the sides of the nose are red, greasy, shiny, and peeling, it indicates a zinc deficiency.
Nail Signal: White spots on the nails indicate a zinc deficiency. Nails that break easily indicate an iron deficiency. Zinc and iron deficiencies can sometimes occur simultaneously.
Hair Signal: Hair loss and easily tangled strands indicate a deficiency in Vitamin C and iron. Fading hair color is a sign of low Vitamin B12.