Im sick of all this poisioning in our foods such as aspartame and flouride, what can I do?

I know there's not much I can do but Im so angry at these organizations. Steroids can harm you, they banned them. McDonald's harms people more than steroids I think. I also think there's a conspiracy about aspartame, yes I know its been approved by the FDA after they got their NEW "boss" and after hiring another staff to make the vote 3-3, they tested it on monkey babies and 5 of them had seizures and 1 of them died. Fluoride "detoxifies" our pineal gland, WHICH IS SO IMPORTANT, they put it in our water because it cleans our teeth but there hasn't been strong Evidence for that. Im so angry what can I Do?