AN	Anorexia nervosa
BMI	Body mass index
ED	Eating disorder
EDE	Eating Disorder Evaluation
HC	Healthy control
M ± SD	Mean ± Standard Deviation
Mo	months
NRCT	Non-randomized control trial
n.s.	non-significant
PICO	Population, intervention, comparison, outcome
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines
PROSPERO	International Prospective Register of Systematic Reviews
ROBINS-I	Risk of Bias in Non-randomized Studies–of Interventions
QUIPS	Quality in Prognosis Study tool
SE-AN	Severe and enduring anorexia nervosa