reaserch journal assignment #2

I chose my topic on nutrition and tampering with natures ways. Is it OK to fortify food with nutrients or use preservatives on food for longer shelf life. some might say yes and others would disagree. i choose this topic because it has two strong sides that see it differently and i have always had a fascination for nutrition and proper eating habits, whats best for you.
I know that for years now the government has been fortifying foods for the populations health for a while now. to what extent is that OK and then who monitors what preservatives are OK for you to ingest. i also know that most nutrition stores today don't have to be checked by the FDA.
what i want to learn about this topic is who controls this why are some things not controlled at all and what is the best thing for all of us to do to be healthy for our own well being.....