I think there was research done back in the 60s or 70s showing a relationship between food additives and ADHD. I'll have to ask my partner who the guy was that did the study; my partner wrote a paper on it when he was in college so he might remember the guys name.

And I'm not sure that legislation is going to make a difference, but education might. Then there's the economic factor, sometimes fast food is actually cheaper and more filling. I know when I was younger, I didn't pay attention to what I was eating. It wasn't until I was pregnant that I really tried to eat healthier.
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