The study will adopt a longitudinal research design with randomized quasi- experimental trial. The workers with overweight or obesity (BMI≧24) provided by the company will be randomly assigned to Group A (four lessons of dietary behavior and six lessons of MBI) or Group B (four lessons of dietary behavior and six lessons of mental health). There will be 100 participants in each group. Data will be collected five times. The research questionnaire includes basic information (including BMI, waist circumference, etc), Perceived Stress Scale, The Five Facet Mindfulness Questionnaire, Food Cravings Questionnaire, the scale of physical activity and information regarding dietary behavior.
