I agree this sucks and I personally struggle to follow anything this strict because I love cooking AND I love eating (the perfect storm for obesity, sadly). However I found a good middle ground is to focus on "Avoid processed food" and sticking to whole foods. Try buy things that don't have bar codes, or stick to the outside of the supermarket (where they tend to put the fresh produce), or whatever.
This is my strategy also. Do your shopping in the produce, butcher, and dairy sections. Stay away from the boxed crap in the middle, and at least for me the bakery section will likely be my eventual downfall.
Of course this requires that you learn to cook, and have the time to do it. If you are going to restaurants all the time it’s a lot harder.
> Of course this requires that you learn to cook, and have the time to do it.
True, although personally I think cooking is one of life's greatest joys! Making things from scratch that taste good and make people (i.e. your family) happy is worth the time, imo, and I try to do a couple good meals a week :)