Table 2.

Search strategy for Pubmed.

1	((((“Breakfast”[Mesh]) OR (((((((((((((Breakfasts[Title/Abstract]) OR (Breakfast Time[Title/Abstract])) OR (Breakfast Times[Title/Abstract])) OR (Time, Breakfast[Title/Abstract])) OR (Times, Breakfast[Title/Abstract])) OR (Morning Meal[Title/Abstract])) OR (Meals, Morning[Title/Abstract])) OR (Morning Meals[Title/Abstract])) OR (meal timing[Title/Abstract])) OR (Cereal[Title/Abstract])) OR (RTEC[Title/Abstract])) OR (Ready To Eat Cereals[Title/Abstract])) OR (breakfast cereal[Title/Abstract]))) AND ((“Breakfast”[Mesh]) OR (((((((((((((Breakfasts[Title/Abstract]) OR (Breakfast Time[Title/Abstract])) OR (Breakfast Times[Title/Abstract])) OR (Time, Breakfast[Title/Abstract])) OR (Times, Breakfast[Title/Abstract])) OR (Morning Meal[Title/Abstract])) OR (Meals, Morning[Title/Abstract])) OR (Morning Meals[Title/Abstract])) OR (meal timing[Title/Abstract])) OR (Cereal[Title/Abstract])) OR (RTEC[Title/Abstract])) OR (Ready To Eat Cereals[Title/Abstract])) OR (breakfast cereal[Title/Abstract]))))
2	(((((“Child, Preschool”[Mesh]) OR (“Adolescent”[Mesh])) OR (“Minors”[Mesh])) OR (“Students”[Mesh])) OR (((((((((((((((((((((((((((Preschool Child[Title/Abstract]) OR (Children, Preschool[Title/Abstract])) OR (Preschool Children[Title/Abstract])) OR (Children[Title/Abstract])) OR (Adolescence[Title/Abstract])) OR (Teens[Title/Abstract])) OR (Teens[Title/Abstract])) OR (Teenagers[Title/Abstract])) OR (Teenager[Title/Abstract])) OR (Youth[Title/Abstract])) OR (Youths[Title/Abstract])) OR (Adolescents, Female[Title/Abstract])) OR (Adolescent, Female[Title/Abstract])) OR (Female Adolescent[Title/Abstract])) OR (Adolescents, Male[Title/Abstract])) OR (Female Adolescents[Title/Abstract])) OR (Adolescent, Male[Title/Abstract])) OR (Male Adolescent[Title/Abstract])) OR (Male Adolescents[Title/Abstract])) OR (juvenile adult[Title/Abstract])) OR (Minor[Title/Abstract])) OR (Minors[Title/Abstract])) OR (Student[Title/Abstract])) OR (School Enrollment[Title/Abstract])) OR (Enrollment, School[Title/Abstract])) OR (Enrollments, School[Title/Abstract])) OR (School Enrollments[Title/Abstract]))))
3	((randomized controlled trial [pt] OR controlled clinical trial [pt] OR randomized [tiab] OR placebo [tiab] OR clinical trials as topic [mesh: noexp] OR randomly [tiab] OR trial [ti]))
4	1 AND 2 AND 3
5	Filters: from 1 January 1990–1 January 2021