http://www.latimes.com/business/money/la-fi-mo-afa-foods-pink-slime-20120402,0,1738478.story
http://eideard.com/tag/testing/
The American farmer is practically regulated to death. What do you mean you can't trust the agencies? You can certainly trust them to increase the cost of food production through over-regulation spurred by people demanding more of the same after they have been stirred up by this type of nonsense.
Americans are unhealthy because they eat too much fatty, sugary, convenience food and don't get enough exercise. It is real easy to avoid most additives... just buy the staples and go to the trouble of prepairing your own meals from scratch. There are also plenty of sources (at least where I live) to get locally grown and butchered meats. Around here it is very easy to buy a grass fed cow off of Craigslist and have the owner deliver it to the butcher of your choice.