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Smell before supper, can eat less, if eat dinner too full can aggravate digestive burden, cause the sleep hormone melatonin secretion decreased, melatonin can lower the body temperature and physical activity ability, and promote sleep.In addition, another study at the university of the United States welling also showed that a mint smell every two hours, can let a person every day little absorb 350 kilocalorie quantity of heat, the equivalent of two rice.