Hair and nail growth have long been linked to overall health. When a person is moving out of an unhealthy state into a more healthy one, the first places to most noticeably respond are hair, skin and nails. Often this change from "unhealthy" to "healthy" is a result of dietary changes, but taking diet off the table, hair and nails might begin a rapid growth in some of these circumstances as well (consider that many of them could be working together):
- increased sleep - lack of sleep lowers immunity and a weak immune system is linked to unhealthy hair/nail growth
- decreased stress - many people have more hair LOSS during times of great stress, indicating that hair folicles weaken with stress. Stress reduction could be linked to increased circulation, better digestion, better (once again) overall health, which is all related back to increased hair/nail growth
- pregnancy or delivery - many women experience a sense of "super health" during pregnancy while others experience the exact opposite. Taking out the factor of prenatal vitamins (which definitely increase hair and nail growth rate and strength) this is more likely due to hormonal fluctuations
Understand also, that often even if there has been no change in diet, a number of other factors (including the three above) can affect how well the body is absorbing nutrients and ridding itself of waste. Elementary as it sounds, this process is vital to health and well being as it affects circulation, which directly affects hair and nail growth.