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Compelling preclinical evidence corroborates a critical role of the endocannabinoid system (ECS) in the central regulation of appetite and food intake. However,<jats:italic>in vivo<\/jats:italic>human evidence on ECS functioning in brain circuits involved in food intake regulation as well as its relationship with body weight is lacking, both in health and disease. Here, we measured cannabinoid 1 receptor (CB<jats:sub>1<\/jats:sub>R) availability using positron emission tomography (PET) with [<jats:sup>18<\/jats:sup>F]MK-9470 in 54 patients with food intake disorders (FID) covering a wide body mass index (BMI) range (anorexia nervosa, bulimia nervosa, functional dyspepsia with weight loss and obesity; BMI range=12.5\u201340.6\u2009kg\/m<jats:sup>2<\/jats:sup>) and 26 age-, gender- and average BMI-matched healthy subjects (BMI range=18.5\u201326.6\u2009kg\/m<jats:sup>2<\/jats:sup>). The association between regional CB<jats:sub>1<\/jats:sub>R availability and BMI was assessed within predefined homeostatic and reward-related regions of interest using voxel-based linear regression analyses. CB<jats:sub>1<\/jats:sub>R availability was inversely associated with BMI in homeostatic brain regions such as the hypothalamus and brainstem areas in both patients with FID and healthy subjects. However, in FID patients, CB<jats:sub>1<\/jats:sub>R availability was also negatively correlated with BMI throughout the mesolimbic reward system (midbrain, striatum, insula, amygdala and orbitofrontal cortex), which constitutes the key circuit implicated in processing appetitive motivation and hedonic value of perceived food rewards. Our results indicate that the cerebral homeostatic CB<jats:sub>1<\/jats:sub>R system is inextricably linked to BMI, with additional involvement of reward areas under conditions of disordered body weight.<\/jats:p>","DOI":"10.1038\/tp.2016.118","type":"journal-article","created":{"date-parts":[[2016,7,12]],"date-time":"2016-07-12T13:53:27Z","timestamp":1468331607000},"page":"e853-e853","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":44,"title":["Association between cerebral cannabinoid 1 receptor availability and body mass index in patients with food intake disorders and healthy subjects: a [18F]MK-9470 PET study"],"prefix":"10.1038","volume":"6","author":[{"given":"J","family":"Ceccarini","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N","family":"Weltens","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H G","family":"Ly","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J","family":"Tack","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L","family":"Van Oudenhove","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K","family":"Van Laere","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,7,12]]},"reference":[{"key":"BFtp2016118_CR1","doi-asserted-by":"publisher","first-page":"1101","DOI":"10.3390\/ph4081101","volume":"4","author":"M-P Viveros","year":"2011","unstructured":"Viveros M-P, Berm\u00fadez-Silva F-J, Lopez-Rodriguez A-B, Wagner EJ . 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