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Obesity has become a major public health problem and should be considered with not only medical aspects also the social and economic aspects. According to the data of the World Health Organization (WHO), obesity and obesity-related diseases cause the death of over a million people worldwide each year. Science of nutrition has proven the effects of nutrition on human health and direct correlation between nutritional habits and the frequency of some diseases. Improvement of national nutrition policies about obesity is within the framework of responsibilities of the public organizations and food industry by considering the new approaches. Development and evaluation of new strategies about reducing the effects of fat and carbohydrates on weight gain are required to prevent or reduce obesity. It has been reported that food constituents, which are naturally found in foods, may be effective on the control of weight gain via various mechanism and have been studied as a new approach for obesity prevention. In this article, recent studies about some foods or bioactive compounds found in foods, which can effect on obesity prevention, are reviewed. [ABSTRACT FROM AUTHOR]