Scurvy. Rickets. Iron deficiency. These are not, we like to believe, disease that affect 21st-century children, certainly not in a country like the United States with an obesity epidemic. But they are. All it takes is a self-restricted eater so stringent that no vitamin C is allowed into his gullet, say. Or a vegetarian not receiving enough protein for her age. Whatever the cause, a small group of our children are failing to thrive despite putting enough calories into their bodies. These links provide information on diseases that might very well be cured by that most magic of medical bullets, the balanced meal.