Table 1. Characteristics of the included studies.

Study	Year	Country	Study design	Subjects (n)a	Intervention	Supplemented dose of vitamin D (IU/d)	Time of intervention
Kelishadi R. et al.20	2014	Iran	RCTb	43	Cholecalciferolc	3571f	12 weeks
Mason C. et al.21	2014	USA	RCTb	188	Cholecalciferol weight loss interventiond	2000	52 weeks
Wamberg L. et al.22	2013	Denmark	RCTb	52	Cholecalciferol	7000	26 weeks
Belenchia A. M. et al.23	2013	USA	RCTb	35	Cholecalciferol	4000	26 weeks
Carrillo A. E. et al.24	2013	USA	RCTb	23	Cholecalciferol calcium resistance traininge	4000g	12 weeks
Salehpour A. et al.25	2013	Iran	RCTb	77	Cholecalciferol	1000	12 weeks
Zhu W. et al.26	2013	China	RCTb	43	Cholecalciferol calcium energy restriction diet (−500 kcal/d)	125g	12 weeks
Beilfuss J. et al.27	2012	Norway	RCTb	332	Cholecalciferol calcium	2857/5714f,g	52 weeks
Harris S. S. et al.28	2012	USA	RCTb	89	Cholecalciferol calcium	4000g	12 weeks
Zittermann A. et al.31	2009	Germany	RCTb	165	Cholecalciferolc	3332	52 weeks
Nagpal J. et al.30	2009	India	RCTb	71	Cholecalciferol	12000	6 weeks
Major G. C. et al.29	2007	Canada	RCTb	63	Cholecalciferol calcium energy restriction diet (−700 kcal/d)	400g	15 weeks

^aNumber of subjects who completed the study.

^bRandomized Controlled Trial.

^cBoth groups also received recommendations for healthy eating and reduction of sedentary activities.

^dLifestyle program included a diet (total daily energy intake of 1200 to 2000 kcal/d based on baseline weight, 30% daily energy intake from fat) and an exercise component (45 min of moderate-to-vigorous intensity exercise 5 d/wk (225 min/wk)).

^eResistance training included: treadmill exercises and eight resistance exercises (leg extension, leg flexion, leg press, hip adduction, hip abduction, chest press, seated row, and lateral pull down).

^fVitamin D was administered once a week.

^gAdditional calcium supplementation (500-1200 mg/d).