In the period 1991-1993, an official study was conducted to measure th
e presence and evaluate the risk of pesticide residues in plantbased f
ood in the Belgian total diet. Positive samples were subjected to one
or more culinary treatments (washing, peeling, steaming, or cooking) t
o determine the decrease of residues in prepared ready-to-eat food. Th
us, better estimates of pesticide residues taken up through consumptio
n were determined and compared with toxicological criteria. Washing di
d not significantly reduce residues. Peeling fruits removed almost all
pesticides. The effects of cooking and steaming varied, depending on
the type of food and pesticide.