As sugar-free gum contains next to no calories, and chewing it precludes one's ability to simultaneously eat food, and maybe it even burns calories (11 per hour, says the Internet), it could seem like a perfect, minty-fresh tool for losing weight. Some research has even suggested that it might act as an appetite suppressant.
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Unfortunately, a study out of Ohio State University found that once such people spit out their gum, they go on to eat just as much as people who don't chew. In the long run, not only does it seem unlikely that chewing gum is an effective tool in losing weight, but it also may lead to nutritional deficiencies.
In the study, people were instructed to chew either NutraTrim Weight Loss Gum ("boosts metabolism and helps to curb food cravings") or Eclipse gum before snacks and meals for a week, and to keep track of everything they ate. Their food diaries revealed that, compared to non-gum chewers, they ate fewer, but larger, meals. Not only did they end up eating about the same number of calories as non-chewers, their meals were less nutritious.