I remember reading that cheese (and dairy products) are actually relatively addictive, apparently because of casein. Here's a link, but it's not the original study just an article about it. I'm sure a google search for "casein yale food addiction study" might turn up better results.
That's correct. Cheese has a really high concentration of the casein protein which breaks down into casomorphins in the gut which then act like an opioid. Cheese is also very high in advanced glycation end products (AGEs) which are known to cause aging.
http://www.independent.co.uk/extras/indybest/food-drink/chee...