{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T15:37:19Z","timestamp":1784043439570,"version":"3.55.0"},"reference-count":61,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2023,4,8]],"date-time":"2023-04-08T00:00:00Z","timestamp":1680912000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Medical Research Council Career Development","award":["MR\/P020372\/1"],"award-info":[{"award-number":["MR\/P020372\/1"]}]},{"name":"Medical Research Council Career Development","award":["15\/0005250"],"award-info":[{"award-number":["15\/0005250"]}]},{"DOI":"10.13039\/501100000274","name":"British Heart Foundation","doi-asserted-by":"publisher","award":["SP\/16\/6\/32726"],"award-info":[{"award-number":["SP\/16\/6\/32726"]}],"id":[{"id":"10.13039\/501100000274","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,8,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>There may be a bidirectional relationship between cognition and adiposity, whereby poor cognition leads to increased adiposity and vice versa. We aimed to determine whether these findings are causal, by undertaking a bidirectional Mendelian randomization (MR) study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total of 378\u200a877 UK Biobank participants had three adiposity indicators [body fat percentage (BF%), body mass index (BMI) and waist-hip ratio] and two cognitive function measures (reaction time, visual memory). We examined observational associations between each adiposity indicator and cognitive function and vice versa. Using bidirectional inverse-variance weighted MR, we estimated the strength of the adiposity-cognitive function association using genetic instruments for adiposity indicators as our exposures, and we repeated this in the opposite direction using instruments for cognitive function.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In the direction adiposity to cognitive function, MR analyses were generally directionally consistent with observational findings, but all confidence intervals contained the null. In the opposite direction, MR estimates for all adiposity measures on reaction time were imprecise and directionally inconsistent. MR estimates for the effects of visual memory on all adiposity measures indicated worse visual memory was associated with lower adiposity. For example, a 1-unit worse visual memory score was associated with a 1.32% [\u03b2\u2009=\u2009\u22121.32; 95% confidence interval (CI): \u22120.77,\u22121.88] and 3.57% (\u03b2\u2009=\u2009\u22123.64; 95% CI: \u22121.84,\u22125.15) lower absolute body fat percentage and relative body mass index, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Observational associations of adiposity on cognitive function are likely not causal. In the reverse direction, our consistent findings that worse visual memory is associated with three adiposity indicators provide support for a causal link between worse visual memory and lower adiposity.<\/jats:p><\/jats:sec>","DOI":"10.1093\/ije\/dyad043","type":"journal-article","created":{"date-parts":[[2023,4,8]],"date-time":"2023-04-08T15:57:56Z","timestamp":1680969476000},"page":"1074-1085","source":"Crossref","is-referenced-by-count":21,"title":["The relationship between adiposity and cognitive function: a bidirectional Mendelian randomization study in UK Biobank"],"prefix":"10.1093","volume":"52","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9140-0776","authenticated-orcid":false,"given":"Tom","family":"Norris","sequence":"first","affiliation":[{"name":"Division of Surgery and Interventional Science, Institute of Sport, Exercise and Health, University College London , London, 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