Table 1. Characteristics of participants from included studies (n = 7).

First Author, publication year	Study design	Country	Participants		Arms	Age (years, mean ± sd)	BMI (kg/m2, mean ± sd)
			Randomized	Analysed
Bihuniak JD, 2016 [21]	Controlled before-and-after study	United States of America	-	16	One arm: MD	77.0±6.8	26.1±3.1
Rodríguez AS, 2016 [15]	Randomized clinical trial	Spain	320	230	Arm 1: intervention group MD Arm 2: control group	53.2±4.3	27.6±5.5 27.3±5.3
Vignini A, 2017 [17]	Randomized clinical trial	Italy	60	60	Arm 1: intervention group supplemented with oral extra virgin olive oil (VOO) enriched with vitamins D3, K1 and B6. Arm 2: control group with oral supplementation with VOO	54.6±3.7 55.6±2.6	25.2±2.7 25.9±3.1
Bajerska J, 2018 [20]	Randomized clinical trial	Poland	144	130	Arm 1: Mediterranean diet (MED) Arm 2: Central European diet (CED)	60.3±4.7 60.8±4.7	33.8±5.6 33.6±4.2
Duś-Żuchowska M, 2018 [18]
Muzsik A, 2019 [19]
Lombardo M, 2020 [16]	Case-control study	Italy	89	89	Arm 1: Menopausal women Arm 2: Fertile women over 45 years of age	57.1±4.9 48.8±4.0	30.6±5.4 29.5±5.0

Note: BMI: Body mass index; DRI: Dietary reference intake; CVD: Cardiovascular diseases; NR: Not reported; MD: Mediterranean diet; CED: Central European diet; VOO: Virgin olive oil.