(e).

Citation/level and quality	Purpose	Sample/setting	Design	Results/conclusion	Recommendations
Schellenberget al., [23] Johns Hopkins level: I Quality: high quality	To review the importance of lifestyle interventions on decreasing progression to diabetes in high-risk patients or progression to complications such as (cardiovascular disease and death).	Nine RCTs on at risk for diabetes and eleven on patients who had diabetes Publications conducted in patients with type 2 diabetes in the world	Systematic review and meta-analysis of RCTs.	Comprehensive lifestyle interventions including diet and physical exercise effectively decrease the incidence of type 2 diabetes. There was no evidence on reducing mortality in patients who already have type 2 diabetes and insufficient evidence on reducing complication	The review included only RCTs studies. A review of cohort studies is advantageous to provide data on the effect of different lifestyle interventions