Objectives:
Nuts are recommended for cardiovascular health, yet concerns remain that nuts may contribute to weight gain due to their high energy density. Therefore, this review article has been conducted.

Objectives:
Malnutrition is a major public health issue that has been associated with high susceptibility for impaired brain development and mental functioning. However, to date studies on this topic have not been collated and appraised. Therefore, this review article has been conducted.

Is malnutrition associated with a poor cognitive development?

Objectives:
Do chair-based exercise programmes improve upper extremity and lower extremity function in older adults?

Study design:
This review article included 25 studies with a total of 1,388 participants.
19 studies were randomised controlled trials (RCTs).

Objectives:
The safety of human papillomavirus (HPV) vaccines, one of the major challenges to public vaccination, has been controversial. Therefore, this review article has been conducted.

What is the safety of different human papillomavirus (HPV) vaccines?

Objectives:
Vitamin D deficiency is frequently associated with several medical conditions. However, a comprehensive meta-analysis assessing the association between vitamin D level and acne is lacking. Therefore, this review article (meta-analysis) has been conducted.

Does a low vitamin D level (expressed as circulating 25(OH)D levels) increase risk of both acne and acne severity?

Study design:
This review article included 13 articles with a total of 1,362 acne patients and 1,081 healthy controls (persons without acne).

Objectives:
Findings on the link between dietary intakes of monounsaturated fatty acids (MUFA) and risk of mortality are conflicting. Therefore, this review article has been conducted.

Does monounsaturated fatty acids dietary intake reduce risk of mortality?

Objectives:
The association between serum 25-hydroxyvitamin D 25(OH)D level (vitamin D level in blood) and asthma occurrence in children was controversial. Therefore, this review article has been conducted.

Objectives:
Does breastfeeding reduce risk of ovarian cancer in women with BRCA1 mutation or BRCA2 mutation?

Study design:
This review article included 1 cohort study and 4 case-control studies with a total of 14,601 women with a BRCA1 or BRCA2 mutation.

There was no publication bias.

Objectives:
Epidemiological studies have shown that higher intake of flavonoid is inversely associated with coronary heart disease (CHD) risk. However, which flavonoid subclass (including anthocyanins, flavonols) could reduce CHD risk has remained controversial. Therefore, this review article has been conducted.

Objectives:
Small-quantity lipid-based nutrient supplements (SQ-LNSs) were designed to provide multiple micronutrients within a food base that also provides energy, protein and essential fatty acids, targeted towards preventing malnutrition in vulnerable populations. Previous meta-analyses demonstrated beneficial effects of SQ-LNSs on child growth, anemia and mortality. However, to further examine the efficacy and effectiveness of SQ-LNSs and explore study-level and individual-level effect modifiers, this review article has been conducted.