“When your diet is lacking in carbs, your body starts burning fat as fuel, producing ketones,” Zuckerbrot says. “Acetone, one of the ketones, causes your breath to smell fruity [and sour].” In fact, one study
found that breath acetone is a good indicator of whether you’re eating too few carbohydrates.
So what’s the right way to go carb-free? “There is no right way. Carbs are a necessity and should not be eliminated from the diet,” Gans says. But if you’re looking to drop a few inches along your waistline, skip the refined sugars and simple starches. In other words, put down the doughnut and grab an apple.
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