There might be something to it -- after all, advertising doesn't usually over-saturate you with the idea and image of a desired food. The image is there for a few seconds, then gone, and you don't see it again until the next commercial break (or longer).
The reason I think there may be a grain of truth there is that I came across a counter-intuitive "trick" a while back for curbing cravings that has worked really, really well that has some similarities to this. Namely, if you have a craving for a specific food, imagine actually eating it, in great sensory detail. Often, the craving then goes away. Maybe this is touching on the same sort of thing.
Height 5'8 1/2"
5K 4/21/11: 31:55
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