Our food supplies ALL have numerous "additives" that could be potentially harmful. The fast food joints are probably among the worst, but by no means the only ones. If a person just visits one of these places occasionally, it probably doesn't matter much. Reading the labels on virtually All processed foods at the grocery store shows that most of our food is laden with "additives". About the Only way to avoid these chemicals would be to have your own small farm, and grow/raise everything yourself with No pesticides, fertilizers, growth hormones, etc., etc.
The average life expectancy has almost doubled in the past 150 years.....from 40 yrs old in the mid 1800's to almost 80 today....so all this "junk" in our food supplies doesn't seem to be hurting most people.