Objectives:
Does pistachio supplementation reduce obesity risk?

Study design:
This review article included 11 randomized controlled trials (RCTs) with 1,593 subjects.

Objectives:
Does wearing a face mask reduce risk of COVID-19 infection?

Study design:
This review article included a total of 6 studies, involving 4 countries.

Objectives:
Is olfactory dysfunction or "loss of smell" a prevalent symptom in COVID-19 patients?

Study design:
This review article included a total of 51 studies with 11,074 confirmed COVID-19 patients. Of these, 21 studies used a control group with 3,425 patients.

Objectives:
Do omega-3 fatty acid supplements (EPA and DHA) improve sarcopenia-related performances among the elderly?

Study design:
This review article included 10 RCTs with 552 participants.
The number of study participants ranged from 24 to 126 and the durations of the interventions spanned 10 to 24 weeks.
The doses ranged from 0.16 to 2.6 g/day of EPA and from 0 to 1.8 g/day of DHA.
The mean ages of the participants across the RCTs ranged from 63 to 75 years old.

Objectives:
A dietary protein intake (DPI) of between 0.6 and 0.8 g protein per kilogram body weight per day (g/kg/day) is frequently recommended for adults with moderate-to-advanced chronic kidney disease (CKD). However, evidence on whether patients with diabetic kidney disease (DKD) actually benefit from a DPI of ≤ 0.8 g/kg/day and from a low-protein diet (LPD) at CKD stages 1-3 has not been consistent. Therefore, this review article has been conducted.

Objectives:
National Institute for Health and Care Excellence (NICE) endorsed clinical frailty scale (CFS) to help with decision-making. However, this recommendation lacks an evidence basis and is controversial. Therefore, this review article has been conducted.

Scientific studies (review articles) on the relationship between diet/nutrients and arteriosclerosis:
A review article of randomized, placebo-controlled double blind clinical trials (RCTs) will answer the following question:
"Do taking dietary supplements make sense?" Yes for a positive conclusion and no for a negative conclusion.

A review article of cohort studies or case-control studies will answer the following question:
"Should I change my diet?".

Objectives:
What is the impact of age, sex, comorbidities and clinical characteristics on the severity of COVID-19?

Study design:
This review article included 55 studies with a total of 10,014 patients with SARS-CoV-2 (COVID-19) infection.

No publication bias was found in case of age (≥50 years, age ≥65 years), comorbidities and clinical manifestations.

Objectives:
Dyslipidemia is a common metabolic disease worldwide and also an important predisposing factor for cardiovascular diseases (CVDs). Coffee is loved by people all over the world; however, the association between coffee consumption and blood lipids has yielded inconsistent results. Therefore, this review article has been conducted.

Objectives:
Emerging evidence suggests young children are at greater risk of COVID-19 infection than initially predicted. However, a comprehensive understanding of epidemiology of COVID-19 infection in young children under 5 years, the most at-risk age-group for respiratory infections, remain unclear. Therefore, this review article has been conducted.