We plan to investigate Myelin Water Fraction (MWF) in the acute state of Anorexia Nervosa (AN). Our study will further the understanding of structural alterations in the brain of patients acutely suffering from anorexia nervosa and possible changes in myelin content in white, cortical and intracortical gray mater areas of the brain. Recent studies suggested decreased intracortical myelin concentration (measured as quantitative T1 values) in AN (Pappaianni et al., 2022) and lower cortical myelin (measured as T1w/T2w ratio) in regions associated with cognitive control (Bischoff-Grethe et al., 2021). We will use a 3D gradient spin echo sequences (GRASE) (Prasloski et al., 2012) to measure MWF in patients acutely suffering from AN and age matched healthy controls.