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There are reports that some scientists are suggesting that fast food may be addictive.

The theory -- which is by no means universally accepted -- is that as people put on weight, they become more resistant to the hormone leptin, which helps people control their eating behavior. Fast food meals, which are high in fat and calories, may in fact work the same way as drug addiction…people lose control and eat more and more, which in turn addicts them to an even greater extent.

There also is a study, just conducted at Rockefeller University, indicating that test rats fed a high fat diet when young grew up to be obese adult rats.
KC's View:
If this is true, and we’re not inclined to accept it at face value for the moment, it would mean that the phrase “betcha can’t eat just one” could be more than an ad slogan; it could be a death sentence.

However, if there is clear evidence of one thing, it is that we shouldn’t ever accept the findings of these studies the first time they are reported. Acrylamides are a perfect example of this – the initial studies got a lot of us worried, and now the newest reports are that the carcinogenic nature of acrylamides aren’t as worrisome as originally thought.