I try to eat as few processed/ready made items as possible as I do think it is healthier. I don't go as extreme as this article - I'll be damned if I'll start grinding my own grains. :roll:
Aside from that, it's actually pretty easy if you aren't too militant - mainly because I grew up in foodie/traditional land not eating those foods or ingredients so I don't really like them (many actually make me sick or send my blood sugar through the roof).
Vegetables from a can just taste nasty to me, we didn't eat casseroles or any ready made food except soup and meat products, we didn't have much fast food, cookies were baked (not bought), and between hunting and gardening and neighbors you could get a wide variety of items, so most of our food was from scratch.
It certainly helps that I can get unprocessed/from scratch cookies, bread, pasta, butter, jelly, produce, salsa, and eggs at the Farmer's market and good produce from local stores.
My processed dietary downfalls are mainly dairy items that I will NOT do without (yogurt, cheese, milk), and starch items that I try to eat very little of - instant mashed potatoes, white rice, tortillas, tortilla chips, and pasta - though Cheerios, sweets, and drinks are also big oops items.