The other go-to on why the USDA guidelines are faulty is Gary Taubes and his book Good Calories, Bad Calories which also covers the history of the so-called lipid hypothesis (that saturated fats are bad for you). I cook with only ghee, bacon grease and coconut oil. Some articles by Taubes:
Sugar - http://www.nytimes.com/2011/04/17/magazine/mag-17Sugar-t.htm...
Fats - http://www.nytimes.com/2002/07/07/magazine/what-if-it-s-all-...