Purpose: This study identified effects of dietary and physical activity interventions including dietary interventions or physical activityinterventions alone or combined dietary-physical activity interventions to improve symptoms in metabolic syndrome including abdominalobesity, high triglycerides, low high density lipoprotein cholesterol, elevated blood pressure, and elevated fasting glucose throughmeta-analysis. Methods: Articles on metabolic syndrome X published from 1988 to 2013 were searched through electronic databases,Google Scholar, and reference reviews. Methodological quality was assessed by the checklist, SIGN (Scottish Intercollegiate GuidelinesNetwork). Results: In the meta-analysis, there were 9 articles reporting 13 interventions with 736 participants. Using random effectmodels, the dietary and/or physical activity interventions showed a lower mean difference in waist circumference ( - 1.30 cm, 95%CI: - 2.44~ - 0.15, p =.027). The combined dietary-physical activity interventions showed a lower mean difference in waist circumference( - 2.77 cm, 95% CI: - 4.77~ - 0.76, p =.007) and systolic blood pressure ( - 5.44 mmHg, 95% CI: - 10.76~ - 0.12, p =.044). Additionally,interventions of over 24 weeks yielded a lower mean difference in waist circumference ( - 2.78 cm, 95% CI: - 4.69~ - 0.87,p =.004) and diastolic blood pressure ( - 1.93 mmHg, 95% CI: - 3.63~ - 0.22, p =.026). Conclusion: The findings indicate that dietaryand/or physical activity interventions for metabolic syndrome reduce central obesity with no adverse effects. This finding providesobjective evidences for dietary and physical activity management on metabolic syndrome as an efficient intervention.