you may be right in some cases, but not in every case as you saidexamples:
betty crocker instant potatoes (4 servings), 12 oz. 2.79
fresh potatoes (8 servings), 5lbs. 2.99
fresh boneless skinless breast of chicken 1.89/lb.
tyson frozen boneless skinless breast of chicken 2.5lb. bag 6.99
you can do the math and see for yourself. those are actual current prices at my local supermarket. i'm a homesteader, 90% of my diet i produce myself. owning a farm makes that a lot easier than the average person to eat fresh and healthy; but the average consumer can do a lot to eat fresh food cost effectively. eat seasonally. example, it's winter- that means fall crops are freshest most plentiful and therefore more affordable. guarantee if you want a rack of lamb and asparagus in december it could be almost double what it would cost you in april- when it's in season. also, buying local (and in bulk) as cliche as it may sound is often a lot smarter bet than hitting up your local chain supermarket weekly, where most things were harvested well over a week ago.... sometimes closer to a month! when i was an undergrad i didn't even have space for a garden but  i would go to the closest farm and buy 50lbs. of fresh farm grown potatoes for 30$ and that would be enough to get me and my 3 roomates through the entire school year. delicious, fresh, cheap, and not covered in pesticides. seems like a no brainer. not saying that's the case for all foods but if you care about your body and the environment enough there is a lot you can do to get away from processed foods.