CNR1 and Fabry disease: In this study, we used positron emission tomography (PET) imaging with the selective CB1R radioligand [18F]MK-947030 to investigate for the first time whether in vivo cerebral CB1R availability in the key homeostatic and reward-related brain areas is associated with BMI in patients with FID covering a wide BMI range (AN, BN, FD with severe weight loss and OB), and in healthy subjects within the normal BMI range.