In this study, rats are compelled to chow down on junk food even after they get shocked repeatedly for eating it, showing how their brains change to crave the junk food despite the small pain it causes. Extra extra, read all about it, junk food is extremely addictive and we (humans, rats) will go to almost any measure to continue eating it, even when it is causing us extreme harm (health/obesity).
http://www.cbc.ca/canada/british-columbia/story/2010/03/29/junk-food-addiction-brain.html#socialcomments
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