saccharin and other sweeteners may paradoxically foster overeating.

At some level, the brain can sense a difference between sugar and no-calorie sweeteners, several studies have demonstrated. Using brain imaging, San Diego researchers now show that the brain processes sweet flavors differently depending on whether a person regularly consumes diet soft drinks.The new findings may help explain an oft-observed association between diet soda consumption and weight gain, the researchers say. Once fooled, the brain’s sweet sensors can no longer provide a reliable gauge of energy consumption.
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