Table 1

Inclusion and exclusion criteria

Inclusion criteriaExclusion criteria
Study design
  • Quantitative, qualitative or mixed-method studies

  • No restriction in language of studies or study. Original peer-reviewed primary research articles

  • Year of publication: 2000 onwards

  • Non-peer-reviewed grey literature and unpublished trials

  • Literature review (eg, scoping review and systematic review)

  • Age: 13–35 years old

  • Can be included with OR without health conditions as long as the condition does not substantially influence diet/eating behaviours

  • Institutional populations

  • Target participants with pre-existing health conditions

  • Pregnant or lactating individuals

  • Researcher-led behavioural interventions or larger-scale behaviour change campaigns that were mostly conducted on commercial social media platforms

  • Interventions in clinical settings

  • Not necessary to have a control group for interventions

Only include the paper when primary outcomes are included
  • Primary outcome

    Quantitative: changes in diet/dietary behaviours/diet pattern

    Qualitative: views and experience in relation to participating in an intervention aimed at changing diet/dietary behaviours/diet pattern

  • Secondary outcomes: energy balance-related outcomes/behaviours such as physical activity, body weight or BMI

  • If the intervention only reported on outcomes that are not listed as the primary outcome, such as alcohol intake, smoking, nutrition supplement use, changes in knowledge about and attitudes towards eating and so on

  • BMI, body mass index.