* Undernourishing: lacking historical nutritional value
* Lopsided / Disproportionate: ingredients are wildly over/ under represented wrt 'nature', like extreme levels of PUFAs in products due to added seed oils
* Addictive Filler: Added suger or other added sweeteners, added corn derivatives, etc
The only way to really avoid this is to go to extremes. For me that means cooking all my own food and tracing as many of my ingredients back to their sources and vetting them. Just buying 'USDA Organic' isn't enough these days, I need to ensure the various farms are not contaminating their soil with pesticides / fertilizers, among other factors.
What I'd really like to see, and this is a bit out there for HN, is a US certification for farmers practicing both USDA Organic and Korean Natural Farming (a somewhat radical organic approach to farming). I trust KNF with my health.