Junk food may seem like an addictive drug because it is. In rats, at least, too much fatty food raises the threshold for feelings of satisfaction, sparking a cycle of compulsive overeating.
In people, addictive drugs such as heroin and cocaine desensitise the brain by raising the threshold of "reward" activity that is needed to feel satisfied: more drug is needed to achieve the same effect.
In the experiment, a group of rats were allowed unlimited access to junk food. And after a while, they were given a painful electric shock if they eat junk food. The rats contiunes to eat even though they would be shocked. This behaviour is similar to rats addicted to cocaine. It is likely that junk food is as addictive as drug, and it may as well applicable to human.
__wah__
interesting experiment but poor rats. Thanks for sharing
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