Can we tell the difference between junk food and fast food?

I am a Unitarian, and the food of my religion appear to be junk foods because the spiritual qualities are also religious. Even if they are nutritious, is it a good idea to ration them, or eat them in small quantities, because of their halluciogenic properties? I know that junk foods are unhealthy, and I do not eat such foods, but a Big Mac can be mistaken for a garage burger of sorts. Please help me draw the line such as, "One makes you fat, the other makes you high. One has cholesterol, the other has LSD" and so on. Given the obesity epidemic, I do not wish for an underground movement to replace all fast food chains if fast food was outlawed, especially to ensure the health of our fellow citizens. Please help, for I am also a professional chef, and I pray to Gaia for someone with a heart to answer with the best of his abiilities. May we be blessed with the bounties of Gaia as long as we live.