{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T04:19:13Z","timestamp":1777868353954,"version":"3.51.4"},"reference-count":94,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T00:00:00Z","timestamp":1777507200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004329","name":"The Slovenian Research and Innovation Agency","doi-asserted-by":"publisher","award":["P3-0396, I0-0029, L3-60156, J3-60060, J3-60062, J1-70030, N3-0484"],"award-info":[{"award-number":["P3-0396, I0-0029, L3-60156, J3-60060, J3-60062, J1-70030, N3-0484"]}],"id":[{"id":"10.13039\/501100004329","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Endocrinol."],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Western diet (WD) consumption accelerates the development of metabolic syndrome (MetS) and type 2 diabetes mellitus (T2DM). This study investigated whether chestnut-derived ellagitannins (FT50) modulate early metabolic alterations associated with WD feeding in C57BL\/6J male mice.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Male C57BL\/6J mice were fed either a western diet (WD) or a WD supplemented with chestnut extract (FT50) for 12 weeks. Body weight, adiposity, glucose tolerance, and indices of insulin action were monitored throughout the study. Glucose and insulin homeostasis were assessed by measuring fasting glucose levels, insulin levels, and the HOMA-IR index. Pancreatic function was evaluated by\n                      <jats:italic>ex vivo<\/jats:italic>\n                      Ca\n                      <jats:sup>2+<\/jats:sup>\n                      imaging in pancreas tissue slices to assess beta cell activation dynamics and islet network coordination.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      WD feeding induced significant body weight gain, adiposity, hyperglycemia, glucose intolerance, changes consistent with impaired insulin action, and partially compensatory hyperinsulinemia. Supplementation with FT50 prevented weight gain and fat accumulation, reduced organ hypertrophy, and was associated with improved glucose and insulin-related parameters without affecting the caloric intake. FT50-fed mice showed improved glucose tolerance from week 4 onward, accompanied by a lower HOMA-IR values and reduced hyperinsulinemia, consistent with improved indirect markers of insulin action relative to WD-fed mice.\n                      <jats:italic>Ex vivo<\/jats:italic>\n                      Ca\n                      <jats:sup>2+<\/jats:sup>\n                      imaging in pancreas tissue slices revealed that in FT50-fed mice, beta cells have higher activation thresholds, longer activation delays, and lower Ca\n                      <jats:sup>2+<\/jats:sup>\n                      activity during the plateau phase, while their network coordination is preserved.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>In sum, these effects indicate reduced beta cell excitability and are consistent with an attenuation of early metabolic alterations under WD conditions. Overall, these findings suggest that FT50 supplementation modulates early WD-induced metabolic changes in male mice. However, the study is limited to early-stage alterations, does not address later stages of metabolic disease, and does not establish direct effects on insulin sensitivity. Within these constraints, chestnut extract represents a potentially promising bioactive dietary intervention for modulating early metabolic responses to WD.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fendo.2026.1802808","type":"journal-article","created":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T11:48:20Z","timestamp":1777549700000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Chestnut-derived ellagitannins (FT50) protect against western diet-induced metabolic dysfunction and preserve beta cell function in mice"],"prefix":"10.3389","volume":"17","author":[{"given":"Ma\u0161a Skelin","family":"Klemen","sequence":"first","affiliation":[{"name":"Institute of Physiology, Faculty of Medicine, University of Maribor","place":["Maribor, 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