Brittleness

By some estimates, about 20 years of women suffer from a condition called "brittle nail syndrome." While it may sound like just a fancy name for nails that break easily, the causes go deeper than that. Brittle nails are ones that can't hold on to moisture, so the layrs of the nail plate dry out and crack.

Medically speaking, it's possible for an under-active thyroid to cause both dry skin and brittle nails. Nutritionally, a diet low in iron can cause nails to become thin, brittle and easily broken (eating more green, leafy vegetables, red meat and eggs will help boost your iron intake). Biotin supplements (a Bcomplex vitamin) have also been shown to improve the condition of brittle nails. And your habits play a role as well. The main culprit: excessive exposure to water. Constantly wetting and drying your hands (and nails) can make brittleness worse.