TABLE 2.

PICOS criteria of inclusion and exclusion.

PICOS criteria	Inclusion criteria	Exclusion criteria
Population	Children and adolescents	Adults, elderly
Intervention	Nutritional counseling strategies	No nutritional intervention
Comparison	Traditional dietary advice	Not applicable
Outcomes	Adherence/compliance rates/nutrition knowledge/dietary intake/nutritional status	Not applicable
Types of studies included	Randomized controlled trials; uncontrolled observational studies; case reports and case series. In case of recommendation from experts, articles were manually included.	Full text not available; opinion articles, conference abstracts, theses, and dissertations; without the outcomes of interest; reviews, guidelines, letters, editorials, comments, news, and in vitro or animal studies
Research question	What information is available in literature about the utilization of nutritional counseling during childhood and adolescence?