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Nail biting, also known as onychophagy or onychophagia, is an oral compulsive habit of biting one's fingernails. It is sometimes described as a parafunctional activity, the common use of the mouth for an activity other than speaking, eating, or drinking. Nail biting is very common, especially amongst children, of which 25–35 percent bite nails.
When nails are clubbed, they grow downward and look like the round part of an upside-down spoon. ... a liver condition in which your body is absorbing too much iron from the foods you eat. This ...
The overall health of your nails can reflect your eating habits, says Destini Moody, RDN, a registered dietitian with Top Nutrition Coaching. “In fact, dietitians who work in clinical settings ...
2. You buffed your nails too much. Just as moisture-laden nails can be prone to peeling and splitting, so can nails that are dried out from too much buffing, according to Dr. Peters.
Thus, in humans, the nail of the index finger grows faster than that of the little finger; and fingernails grow up to four times faster than toenails. [10] In humans, fingernails grow at an average rate of approx. 3.5 mm (0.14 in) a month, whereas toenails grow about half as fast (approx. average 1.6 mm (0.063 in) a month). [11]
Nail clubbing - nails that curve down around the fingertips with nailbeds that bulge is associated with oxygen deprivation and lung, heart, or liver disease. Koilonychia - spooning, or nails that grow upwards. Associated with iron-deficiency anaemia or vitamin B 12 deficiency. [citation needed] Pitting of the nails is associated with psoriasis.
However, it turns out that the down side of nail-biting extends far beyond grossing out your friends at the dinner table. Don't let their small size fool you ...
Human nails grow at a rate which varies with many factors: age, the specific digit, as well as nutrition. However, typically in healthy populations fingernails grow at about 0.1 mm/day and toenails at about 0.05 mm/day.