The Centers for Disease Control have released a new study revealing that switching to organic foods provides children with "dramatic and immediate" protection from toxic pesticides. The scientists tested the urine of elementary school children for 15 days. Children ate conventional foods for ten of the days and ate organic foods for five days. Pesticide levels increased five-fold in the children's urine as soon as conventional foods were reintroduced to their diet. The study concludes, that many children are primarily exposed to pesticides through their diet, and not necessarily through other methods.
Find more study info at the Organic Consumers Assocation
Here is the downloadable report for the nitty-gritty.