Because it does not reflect what you actually look like, but what you will look like if you fail to eat well and exercise properly.

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If you like nutritional value, eat what you consider to be the most nutritious fruit and vegetable.

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Grab what you like to eat.

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If you eat a lot of macaroni and cheese and like clean plates, what should you do?

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"I think we're close to the point where, instead of a dietitian saying, 'Eat less fat, eat more fruits and vegetables, ' they could figure out what foods you do or don't like with a survey or genetic test, " says John Hayes, a professor of food science at Penn State and lead author of a 2010 study showing supertasters' preference for salt.

WSJ: People Who Taste Too Much