Pesticides have been associated with higher rates of ADHD (Attention-Deficit/Hyperactivity Disorder). This was found both in kids growing up on farms, as well as kids growing up in inner city homes with lots of use of insecticides.
I usually eat 1/2 – 1 lb of green veggies (cooked; spices; no salt; 1 teaspoon olive oil) for lunch and dinner. I eat fruit (not juice) in between meals if I get hungry.