As explained below, this was a longitudinal study measuring fluctuating pesticide byproducts in urine samples among the
same group of children as they switched from conventional to organic to conventional foods (consistent diet throughout).
Look at the dramatic drop during the organic phase!
Malathion metabolates:
Chlorpyrifos metabolates:
A longitudinal study accomplished by researchers at Univ of Washington, Emory, and the CDC and published by the NIH studied urine samples from children during phases in which the children were given a conventional diet and an equivalent (same menu choices) organic diet. The study found a "dramatic and immediate" reduction in pesticide exposure in children eating organic food.
Children in the study were tested for pesticide concentrations in their urine for 15 days. During the first 3 days ("Stage I"), children were fed a conventional (nonorganic) diet; for the next 7 days("Stage II"), they were fed an equivalent organic diet; and for 7 more days ("Stage III"), they were fed a conventional (nonorganic) diet again.
The study's conclusions:
"We conclude that organic diets provide a protective mechanism against OP (organo phosphate) pesticide exposure in young children whose diets regularly consist of fresh fruit and vegetable, fruit juices, and wheat-containing items. Such protection is dramatic and immediate. This is particularly true for certain OP pesticides, such as chlorpyrifos and malathion as measured in this study, and is probably true for other OPs like azinphosmethyl, dimethoate, and acephate, which are only registered in agricultural production. "