Originally Posted by halon
Pretty much everything you eat has preservatives.
The best thing anyone could do is grow your own fruits and vegetables and hunt for your own meat.
That's certainly true of most processed foods.
It's not generally true of fresh (which are not preserved), frozen and tinned (both of which are different preservation methods) foods.
One of the biggest issues with fast foods are transfats, however these are also in all sorts of other processed foods including things you might not expect like cookies and cakes. Basically, if you see Palm Oil (or derivates) in the ingredients, leave it on the supermarket shelf.