The present invention relates to a composition containing a Lycopus lucidus Turcz. extract as an active ingredient for prevention, treatment, or alleviation of obesity. It was confirmed that the Lycopus lucidus Turcz. extract according to the present invention had effects of suppressing a body weight increase and a fasting blood sugar level increase caused by a high-fat diet, increasing an energy metabolic rate, and alleviating impaired glucose tolerance in dietary obesity-induced mouse models. Therefore, the Lycopus lucidus Turcz. extract can be advantageously used for prevention, treatment, or alleviation of obesity as well as obesity-related complications that may be caused by weight increase.
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