As someone who has tried to hack his way out of unhealthy eating (and succeeded somewhat), I've found that the biggest grocery shopping tip is to go to the store just after a meal.
I really couldn't say it any better than this. Vegetables people. Get more of them. Fresh ones. Learn to enjoy onions and mushrooms.
I think you just contradicted yourself entirely.
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"The current international Codex Alimentarius standard allows for 20 parts per million of gluten in so-called "gluten-free" foods" - http://en.wikipedia.org/wiki/Gluten-free_diet
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It's enough to prevent exacerbation of symptoms for those with gluten sensitivity, but it's not a complete removal.
Celiacs don't even eat food prepared in the same production environment as foods that contain gluten. The sentiment that these people are deluding themselves because their very careful planned and meticulously controlled gluten free diets still contain gluten is preposterous.
The last time I saw my cousin she looked and acted anorexic, meanwhile raving about her new gluten free vegan lifestyle. She looked terrible. My other cousin who suffers from narcolepsy was on the same diet raving about all her new energy while falling asleep at the table. Meanwhile I went from being the fattest person in the family to the most in shape in less than 10 months. I usually jokingly order a side of gluten these days, just to piss the gluten freers off.
Tip for American grocery shoppers: Don't hit the isles. Stay within the vegetable and fruits section, shop there, only there, then leave. That is a healthy diet. Usually there are nuts and meat in that section. Don't be looking for the gluten free potato chips and cookies, that isn't healthy.