Table 2.

Inclusion and exclusion criteria for studies

Inclusion criteria	Exclusion criteria
Original human observational studies (cross-sectional, case control or cohort studies)	Interventional studies, case series, systematic review/ meta-analysis, case reports
Studies assessing the relationship between dietary patterns and HRQOL in all age groups and different disease	Studies that did not report HRQOL as an outcome
Studies were included if they evaluated the HRQOL with a valid questionnaire including but not limited to: SF-12, SF-36, WHOQOL, EORTC QLQ-C 30, PedsQL 3.0DM	–
Studies that evaluated the dietary intake by FFQ, 24-h recall methods, food records or similar instruments	–
Studies that examined whole diet (regardless of methods used to define dietary patterns)	Studies that examined single nutrients, single foods, or single food groups