Proper hydration is a key factor in healthy hair and in promoting good health. Every cell and every system in the body uses water to function properly, so don’t just wash your hair in it, drink lots of it. Other conditions that may contribute to poor nutrition and cause hair loss as a side effect include eating disorders such as anorexia. Anorexia can cause severe malnutrition and cause a high proportion of hair follicles to stop their growth cycle. Rapid weight loss is another reason for accelerated hair loss. Dropping weight too quickly and/or participating in a fad diet that is not nutritionally sound can cause imbalances in the body and result in increased hair loss.