Table 2.

The components of the SPIDER framework used for the identification of relevant studies.

Sample	Patients with Prediabetes or DM (T1DM/T2DM) of Any Age
Phenomenon of Interest	ON measures, tendencies, prevalence and correlates
Design	Original published research (any design, with emphasis on cross-sectional studies), including grey literature
Evaluation	Characteristics, views, experiences, prevalence
Research type	Quantitative and mixed methods peer-reviewed studies; grey literature including third-sector and government reports and briefings, educational theses, conference proceedings

ON, Orthorexia Nervosa; DM, Diabetes Mellitus; T1DM, Type 1 Diabetes Mellitus; T2DM, Type 2 Diabetes Mellitus.