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Most of the changes depend on the accelerated gastric emptying observed in Roux-en-Y gastric bypass (RYGB) and, to a lesser extent, in sleeve gastrectomy (SG). The rapid delivery of meal into the jejunum, particularly after RYGB, contributes to the prompt appearance of glucose in peripheral circulation. Glucose increase is the principal determinant of GLP-1 increase with the consequent stimulation of insulin secretion, the latter balanced by a paradoxical glucagon increase that stimulates EGP to prevent hypoglycaemia. Protein digestion and amino acid absorption appear accelerated after RYGB but not after SG. After RYGB, the adaptation of the gut to the new condition participates to the metabolic change. The intestinal transit is delayed, the gut microbioma is changed, the epithelium becomes hypertrophic and increases the expression of glucose transporter and of the number of cell secreting hormones. These changes are not observed after SG. After RYGB\u2014less after SG\u2014bile acids (BA) increase, influencing glucose metabolism probably modulating FXR and TGR5 with an effect on insulin sensitivity. Muscle, hepatic and adipose tissue insulin sensitivity improve, and the gut reinforces the recovery of IS by enhancing glucose uptake and through the effect of the BA. The intestinal changes observed after RYGB result in a light malabsorption of lipid but not of carbohydrate and protein. In conclusion, functional and morphological adaptations of the gut after RYGB and SG activate inter-organs cross-talk that modulates the metabolic changes observed after surgery.<\/jats:p><jats:p><jats:bold>Level of evidence<\/jats:bold> Level V, narrative literature review.<\/jats:p>","DOI":"10.1007\/s40519-021-01194-5","type":"journal-article","created":{"date-parts":[[2021,4,25]],"date-time":"2021-04-25T08:55:09Z","timestamp":1619340909000},"page":"449-461","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Nutrients handling after bariatric surgery, the role of gastrointestinal adaptation"],"prefix":"10.1007","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9015-7244","authenticated-orcid":false,"given":"Stefania","family":"Camastra","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria","family":"Palumbo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ferruccio","family":"Santini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,4,24]]},"reference":[{"key":"1194_CR1","doi-asserted-by":"publisher","DOI":"10.1007\/s11695-014-1311-1","author":"H Buchwald","year":"2014","unstructured":"Buchwald H, Buchwald JN, McGlennon TW (2014) Systematic review and meta-analysis of medium-term outcomes after banded Roux-en-Y gastric bypass. 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