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Note added at 4 mins (2010-01-24 15:10:00 GMT)
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A food craving is an intense desire to consume a specific food, as opposed to general hunger. Food cravings are especially common in people following structured diet plans, and can be difficult to overcome.
http://en.wikipedia.org/wiki/Food_craving


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Note added at 6 mins (2010-01-24 15:11:37 GMT)
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Между двумя терминами существенное отличие. Increased appetite - общее чувство голода, в отличие от сильного желания съесть что-нибудь эдакое.

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Note added at 8 mins (2010-01-24 15:14:06 GMT)
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Вот русские примеры:
http://tinyurl.com/ydnozey

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Note added at 2 hrs (2010-01-24 17:41:33 GMT)
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Вот еще хороший источник информации:
While the tendency for us to experience cravings for salty and sweet foods has been documented previously, the lab found that nearly 40 percent of "comfort-giving foods" do not fall into the traditional categories of snacks or desserts.
http://weightloss.about.com/cs/cravings/a/cravingclues.htm
Вот еще:
Decode your food cravings
When you crave salty food
What it says about your body: If nothing but the saltiest french fry will do, you may have a mineral deficiency.
http://www.msnbc.msn.com/id/33589896/ns/health-diet_and_nutr...
Мне кажется, что этих ссылок достаточно для подтверждения версии, что food craving - это тяга к определенному виду пищи, а не к пищее вообще.