You sleep for eight hours every night, yet still wake up feeling as though you barely rested. Your hair may seem thinner than usual, or your nails might keep splitting, but you simply attribute it to stress or aging. This is the deceptive nature of nutritional deficiencies. Unlike a sudden flu or a sprained ankle, a lack of essential vitamins and minerals rarely announces itself with obvious symptoms. Instead, it develops quietly over time. Because these warning signs are oft