From what I've read, since non-caloric sweeteners don't trigger an insulin response, you don't get the sense of satiety that you would with sugared foods (and it doesn't work the same in beverages as it does in food, like yogurt). So if you're not watching what you're eating and you're just digging away at that 40oz tub of sugar-free yogurt, you'll eat more of it than you would if it had sugar if you're relying on satiety to tell you when to stop.
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