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Whether this represents evidence of accelerations in obesity-driven atrophy or is instead a legacy of developmental differences established earlier in the lifespan remains unclear.<\/jats:p>\n               <jats:p>This study investigated whether early-life differences in adiposity explain differences in numerous adult brain traits commonly attributed to mid-life obesity.<\/jats:p>\n               <jats:p>We used a two-sample life course Mendelian randomization study in 37 501 adults recruited to UK Biobank (UKB) imaging centres from 2014, with secondary analyses in 6996 children assessed in the Adolescent Brain Cognitive Development Study (ABCD) recruited from 2018. Exposures were genetic variants for childhood (266 variants) and adult (470 variants) adiposity derived from a genome-wide association study (GWAS) of 407 741 UKB participants. Primary outcomes were: adult total brain volume; grey matter volume, thickness and surface area; white matter volume and hyperintensities; and hippocampus, amygdala and thalamus volumes at mean age 55 in the UKB. Secondary outcomes were equivalent childhood measures collected at mean age 10 in ABCD.<\/jats:p>\n               <jats:p>In the UKB, individuals who were genetically predicted to have had higher levels of adiposity in childhood were found to have multiple smaller adult brain volumes relative to intracranial volume [e.g. z-score difference in normalized brain volume per category increase in adiposity\u201495% confidence interval (CI) = \u22120.20 (\u22120.28, \u22120.12); P = 4 \u00d7 10\u22126]. These effect sizes remained essentially unchanged after accounting for birthweight or current adult obesity in multivariable models, whereas most observed adult effects attenuated towards null [e.g. adult z-score (95% CI) for total volume = 0.06 (\u22120.05, 0.17); P = 0.3]. Observational analyses in ABCD showed a similar pattern of changes already present in those with a high body mass index by age 10 [z-score (95% CI) = \u22120.10 (\u22120.13, \u22120.07); P = 8 \u00d7 10\u221213], with follow-up genetic risk score analyses providing some evidence for a causal effect already at this early age. Sensitivity analyses revealed that many of these effects were likely due to the persistence of larger head sizes established in those who gained excess weight in childhood [childhood z-score (95% CI) for intracranial volume = 0.14 (0.05, 0.23); P = 0.002], rather than smaller brain sizes per se.<\/jats:p>\n               <jats:p>Our data suggest that the persistence of early-life developmental differences across the life course may underlie numerous neuroimaging traits commonly attributed to obesity-related atrophy in later life.<\/jats:p>","DOI":"10.1093\/brain\/awae198","type":"journal-article","created":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T18:07:41Z","timestamp":1718734061000},"page":"133-142","source":"Crossref","is-referenced-by-count":11,"title":["Childhood adiposity underlies numerous adult brain traits commonly attributed to midlife obesity"],"prefix":"10.1093","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4323-2189","authenticated-orcid":false,"given":"Scott T","family":"Chiesa","sequence":"first","affiliation":[{"name":"Medical Research Council Unit for Lifelong Health and Ageing at UCL, Institute of Cardiovascular Science, UCL , London WC1E 7HB ,","place":["UK"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lydia","family":"Rader","sequence":"additional","affiliation":[{"name":"Institute for Behavioral Genetics, University of Colorado Boulder , Boulder, CO 80309 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5127-0890","authenticated-orcid":false,"given":"Victoria","family":"Garfield","sequence":"additional","affiliation":[{"name":"Medical Research Council Unit for Lifelong Health and Ageing at UCL, Institute of Cardiovascular Science, UCL , London WC1E 7HB 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BS8 2BN ,","place":["UK"]},{"name":"Population Health Sciences, Bristol Medical School, University of Bristol , Bristol BS8 1UD ,","place":["UK"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5432-5271","authenticated-orcid":false,"given":"Alun D","family":"Hughes","sequence":"additional","affiliation":[{"name":"Medical Research Council Unit for Lifelong Health and Ageing at UCL, Institute of Cardiovascular Science, UCL , London WC1E 7HB ,","place":["UK"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7918-2040","authenticated-orcid":false,"given":"Tom G","family":"Richardson","sequence":"additional","affiliation":[{"name":"MRC Integrative Epidemiology Unit, University of Bristol , Bristol BS8 2BN 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