They've been saying this for a couple years about diet soda:

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A University of Texas Health Science Center survey in 2005 found that people who drink diet soft drinks may actually gain weight; in that study, for every can of diet soda people consumed each day, there was a 41% increased risk of being overweight.

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I don't generally buy anything "diet" or "low fat". The less mucked with the better I feel it is for me. The concept of non-fat cream, for example, makes me cringe.