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We analyzed adult zoo body mass (BM) data of 1290 chimpanzees, 141 bonobos, 231 Bornean orangutans, 186 Sumatran orangutans, and 719 Western gorillas in comparison to BM of free\u2010ranging conspecifics. Females and males considered overweight or obese were 62% and 45% in chimpanzees, 14% and 3% in bonobos, 88% and 81% in Bornean and 74% and 72% in Sumatran orangutans, and 67% and 12% in Western gorillas. The higher degree of overweight in females might also be linked to a lack of reproductive activity. Historical improvements, if at all, were evident in gorillas. We hypothesize that the main cause of obesity is the use of diet items that are low in fiber, high in easily digestible carbohydrates, and therefore highly palatable (such as cultivated fruit and pelleted or extruded compound feeds high in starch), instead of the recommended use of higher\u2010fiber items. As zoo animals do not choose diets for themselves but are provided with the items they can choose from, it is the responsibility of zoos to provide primates with diet items that can safely be used in a group setting without the incentive of overeating and the risk of monopolization by dominant individuals, that is, most plausibly, high\u2010fiber diets. For the optimal welfare of such long\u2010living taxa, the focus under human care should shift from sheer longevity to health span, for which the prevention of obesity is key.<\/jats:p>","DOI":"10.1002\/ajp.70185","type":"journal-article","created":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T05:54:54Z","timestamp":1783922094000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Global Data From Great Ape Zoo Populations Confirm a High Prevalence of Overweight Individuals"],"prefix":"10.1002","volume":"88","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-8920-6236","authenticated-orcid":false,"given":"Jo\u00e3o Pedro","family":"Meireles","sequence":"first","affiliation":[{"name":"Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty University of Zurich Zurich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Byrne","sequence":"additional","affiliation":[{"name":"Dublin Zoo Dublin Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6046-6406","authenticated-orcid":false,"given":"Paul W.","family":"Dierkes","sequence":"additional","affiliation":[{"name":"Bioscience Education and Zoo Biology Goethe University Frankfurt Frankfurt Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-8023-2234","authenticated-orcid":false,"given":"Miriam","family":"G\u00f6bel","sequence":"additional","affiliation":[{"name":"Zoo Zurich Z\u00fcrich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3995-419X","authenticated-orcid":false,"given":"Max","family":"Hahn\u2010Klimroth","sequence":"additional","affiliation":[{"name":"Bioscience Education and Zoo Biology Goethe University Frankfurt Frankfurt Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arun","family":"Idoe","sequence":"additional","affiliation":[{"name":"Burgers, Zoo Arnhem The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9996-064X","authenticated-orcid":false,"given":"Dennis W. 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