According to a study carried out by scientists from Harbin Medical University in China, people who chew their food more take in fewer calories — subsequently they will have control over their weight.
Scientists made the study participants to chew food 40 times instead of typical 15 times. They found that the participants took in 12% calories less than what they normally would have. The result was demonstrated by the American Journal of Clinical Nutrition.
Prior to this, many researches have been carried out to find if there is any connection between obesity and chewing but they end up with mixed results. Some studies concluded obesity arises as a result of quick eating and less chewing.
According to co- author Shuran Wang, if people chew more they will have lower levels of ghrelin (appetite stimulating hormone) and higher levels of CCK (appetite reducing harmone).
Adam Drewnowski, Director of the University of Washington Center for Obesity Research in Seattle, states that if there is a 12% reduction of calorie intake, then there will be 25 pounds weight loss in 1 year. However, he also stated 25 pounds weight loss cannot be achieved since our diet includes non-chew items such as ice-cream, soup, etc.
I suppose that if you chew each bite of food 100 times or more you may end up eating less. However, I am not sure that this is a viable obesity prevention measure.
According to the Centre for Disease Control and Prevention (CDC), more than one-third adults are obese, which causes health problems such as heart disease and diabetes. If the study hypothesis is true then it will have a major impact in the chewing style of these obese people.