TABLE 1.

Inclusion and exclusion criteria¹

Inclusion criteria	Exclusion criteria
• RCTs, cohort studies, case series	• Editorials, reviews, case studies, commentaries, gray literature
• Prospective and retrospective studies	• Non–English language studies
• Male or female patients, any age	• In vitro or animal studies
• Diagnosis of schizophrenia
• GFD intervention OR gluten challenge after GFD

¹GFD, gluten-free diet; RCT, randomized controlled trial.