From the moment a child arrives in our lives, we worry about whether they are thriving on the food we provide for them. Today, we must consider not only the nutritional value of foods, but also their source, the processing methods and the presence of pesticides, dyes and other chemical additives. And because many children do not eat a wide variety of foods, they may be more highly exposed to the chemicals found in the few foods they do eat. A child’s body is particularly vulnerable because of its small size, rapid growth and still-developing immune, detoxification and elimination systems.