Overview and characteristics of included studies.

NR, not reported; PCOS, polycystic ovary syndrome; T2DM, type 2 diabetes; Met S, metabolic syndrome; Wt, body weight; BMI, body mass index; WHR, waist hip ratio; WC, waist circumference.General health, overall health status apart from overweight/obese.The study by Thorsdottir et al had a fish oil capsules group (1.5 g/d EPA + DHA) and fatty fish diet group (3g/d EPA+DHA).The study by Crochemore et al was given fish oil capsules with 0.54 or 0.9 g/d EPA +DHA.The study by Sjoberg et al was given fish oil capsules with 0.64, 1.28, or 1.92g/d EPA +DHA.The study by Moore et al compared 4.5g/week EPA+DHA plus rapeseed oil with 0.7g/week EPA+DHA plus rapeseed oil; 4.5g/week EPA+DHA plus sunflower oil with 0.7g/week EPA+DHA plus sunflower oil.The studies by Mori, Hill, and Munro et al included comparisons with participants underwent fish oil alone or combined with weight loss program.Overview and characteristics of included studies.