Objectives:
The associations between dietary carbohydrate and diverse health outcomes remain controversial and confusing. Therefore, this review article (meta-analyse) has been conducted.

Objectives:
Are there differences in clinical spectrum and management regimen between COVID-19 first infections and reinfections?

Study design:
This review article included 81 studies from 22 countries reporting 577 cases.
45 studies (55.6%) were case reports and 36 studies (44.4%) were case series.

Objectives:
The association between vitamin C and metabolic syndrome (MetS) has been evaluated in several epidemiological studies with conflicting results. Therefore, this review article has been conducted.

Objectives:
Are high CRP levels a biomarker for the early detection and monitoring of malaria severity?

Study design:
This review article included 29 studies. All included studies reported the quantitative data of CRP in patients were published between 1989 and 2021.
Among the included studies, there were 731 cases of severe malaria, 1,600 cases of uncomplicated malaria, 1,697 cases of asymptomatic malaria and 3,658 cases of healthy/febrile controls.

Objectives:
Do diets rich in protein causually reduce body weight of adults with overweight or obesity? 

Study design:
This review article included 37 RCTs.
The diets were included during a mean of 32 weeks interventions, ranging from 8 to 104 weeks.

There was no publication bias.

Objectives:
Previous studies have not fully described the relationship between high-density lipoprotein cholesterol (HDL-C) and death risks from all cause and cardiovascular disease (CVD). Therefore, this review article has been conducted.

Objectives:
What is the overall effectiveness of mRNA-1273 vaccine (Moderna COVID -19 vaccine) against COVID-19 caused by delta variant (B.1.617.2) from large real-world studies?

Study design:
This review article included 5 studies.

Objectives:
What is the efficacy of COVID-19 mRNA vaccines against symptomatic COVID-19 infection among the immunocompromised patients?

Study design:
This review article included 20 studies reported positive rates of anti-SARS-CoV-2 spike protein IgG with a total of 2,219 immunocompromised patients and 4 studies with a total of 42,821 patients evaluated vaccine effectiveness against symptomatic COVID-19 infection among immunocompromised patients vaccinated with 2 doses.

Objectives:
Does the SARS-CoV-2 vaccine (COVID-19 vaccine) reduce risk of COVID-19 infections in inflammatory bowel disease (IBD) patients?

Study design:
This review article included 11 studies with 27,454 IBD patients that received SARS-CoV-2 vaccinations.

Objectives:
The associations between intake of anthocyanins and anthocyanin-rich berries and cardiovascular risks remained to be established. Therefore, this review article has been conducted.

Do purified anthocyanin supplements and dietary intakes of anthocyanin-rich berries reduce cardiovascular risk?

Study design:
This review article included 44 eligible RCTs consisting of 52 comparison groups and 2,353 subjects and 15 prospective cohort studies with 5,54,638 subjects (persons).