Do you believe there is a connection of mothers consuming junk food and children being born with ADD?

According to research scientist on Nightline parents who eat poorly or massive amounts of junk food birth a higher percent of babies with ADD and other stress related problems (at least if monkeys are that close to us to be an indicator) Do you think this suppose generation high in ADD was caused by junk food and it would have been better if people had gone more organic? If most people were vegan would ADD and such be less also?