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In a cross-sectional study, we tested flavor-nutrient conditioning (FNC) with maltodextrin-enriched yogurt, with maltodextrin previously optimized for concentration and dextrose equivalents (<jats:italic>n<\/jats:italic> = 57), and to mask texture cues (<jats:italic>n<\/jats:italic> = 102). After conditioning, healthy volunteers (<jats:italic>n<\/jats:italic> = 52) increased preference for maltodextrin-paired (+102 kcal, CS<jats:sup>+<\/jats:sup>), relative to control (+1.8 kcal, CS<jats:sup>-<\/jats:sup>) flavors, as assessed according to intake, but not pleasantness. In a clinical study (<jats:italic>n<\/jats:italic> = 61), behavioral conditioning without effects on pleasantness was confirmed across pre-bariatric candidates with obesity, weight-stable post-surgery patients, and healthy controls, without significant differences between groups. Striatal dopamine D2-like receptor (DD2lR) availability, assessed with [<jats:sup>123<\/jats:sup>I]IBZM SPECT, was reduced in the obesity group and strongly correlated with conditioning strength and a measure of restrained eating in patients with gastric bypass. These results show that postingestive nutrient stimulation influences human food choices through behavioral reinforcement, and is conserved in obesity and after bariatric surgery.<\/jats:p>\n<jats:p><jats:bold>Trial Registration:<\/jats:bold> <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/doi.org\/10.1186\/ISRCTN17965026\" xlink:type=\"simple\">ISRCTN17965026<\/jats:ext-link>: Dopaminergic neurotransmission in dietary learning and obesity.<\/jats:p>","DOI":"10.1371\/journal.pbio.3002936","type":"journal-article","created":{"date-parts":[[2024,12,17]],"date-time":"2024-12-17T18:21:48Z","timestamp":1734459708000},"page":"e3002936","update-policy":"https:\/\/doi.org\/10.1371\/journal.pbio.corrections_policy","source":"Crossref","is-referenced-by-count":12,"title":["Postingestive reward acts through behavioral reinforcement and is conserved in obesity and after bariatric surgery"],"prefix":"10.1371","volume":"22","author":[{"given":"Gabriela","family":"Ribeiro","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana B.","family":"Fernandes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco P. 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