{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T06:28:16Z","timestamp":1787725696462,"version":"build-2784847793"},"reference-count":57,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2025,7,28]],"date-time":"2025-07-28T00:00:00Z","timestamp":1753660800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Vitality Gesf S.L.","award":["88-2022"],"award-info":[{"award-number":["88-2022"]}]},{"name":"Spanish Projects","award":["PID2019-103872RB-I00"],"award-info":[{"award-number":["PID2019-103872RB-I00"]}]},{"name":"Spanish Projects","award":["\/AEI\/10.13039\/501 100 011 033"],"award-info":[{"award-number":["\/AEI\/10.13039\/501 100 011 033"]}]},{"name":"Spanish Projects","award":["TEC-2024\/BIO-307-BICAROBESITY-CM"],"award-info":[{"award-number":["TEC-2024\/BIO-307-BICAROBESITY-CM"]}]},{"DOI":"10.13039\/100012818","name":"Community of Madrid","doi-asserted-by":"crossref","award":["BOCM number 307"],"award-info":[{"award-number":["BOCM number 307"]}],"id":[{"id":"10.13039\/100012818","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Background\/Objectives: Diatomaceous earth (DE), a natural substance rich in amorphous silica and recognized as a food additive, is gaining attention as a dietary silicon supplement. However, its bioavailability and impact on lipid digestion and absorption remain poorly characterized. This study aimed to investigate silicon bioavailability after short-term DE supplementation and its effects on postprandial glycemia and triglyceridemia, the expression of lipid metabolism-related proteins, and the modulation of the intestinal mucosal barrier. Methods: Female Wistar rats received daily oral supplementation of DE (equivalent to 2 or 4 mg silicon\/kg body weight) for one week. Silicon digestibility, excretion, and hepatic accumulation were quantified. Postprandial glycemia and triglyceridemia were monitored. Lipid profile was analyzed by HPSEC in gastric and intestinal contents. Jejunal morphology and mucin-secreting cells were assessed histologically. Lipid metabolism markers were evaluated by immunohistochemistry and Western blot in both intestinal and hepatic tissues. Results: DE supplementation enhanced silicon absorption and increased hepatic levels. Fecal output and moisture content were also elevated, especially at the higher dose. DE significantly reduced postprandial triglyceridemia and consequently increased luminal triglyceride retention. These changes were associated with decreased jejunal levels of IFABP, ACAT2, and MTP, as well as reduced hepatic levels of MTP and LDLr, alongside increased levels of ABCG5\/G8 and LXR\u03b1\/\u03b2, indicating a partial blockage of lipid absorption and enhanced cholesterol efflux. The effects on the intestinal barrier were evidenced by villi shortening and an increase in mucin-producing cells. Conclusion: Food-grade DE is a bioavailable source of silicon with hypolipidemic potential, mainly by reducing intestinal lipid absorption. This is supported by lower postprandial triglycerides, increased luminal lipid retention, and decreased expression of lipid transport proteins. The study in healthy female rats underscores the importance of sex-specific responses and supports DE as a dietary strategy to improve lipid metabolism.<\/jats:p>","DOI":"10.3390\/nu17152452","type":"journal-article","created":{"date-parts":[[2025,7,28]],"date-time":"2025-07-28T09:53:02Z","timestamp":1753696382000},"page":"2452","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Diatomaceous Earth Supplementation as a Bioavailable Silicon Source Modulates Postprandial Lipid Metabolism in Healthy Female Rats"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6864-5719","authenticated-orcid":false,"given":"Roc\u00edo","family":"Redondo-Castillejo","sequence":"first","affiliation":[{"name":"Pharmacology, Pharmacognosy and Botany Department, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina","family":"Hern\u00e1ndez-Mart\u00edn","sequence":"additional","affiliation":[{"name":"Departmental Section of Physiology, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jousef","family":"Issa-Garc\u00eda","sequence":"additional","affiliation":[{"name":"Departmental Section of Physiology, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7040-2126","authenticated-orcid":false,"given":"Ar\u00e1nzazu","family":"Bocanegra","sequence":"additional","affiliation":[{"name":"Pharmacology, Pharmacognosy and Botany Department, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6987-4203","authenticated-orcid":false,"given":"Alba","family":"Garcimart\u00edn","sequence":"additional","affiliation":[{"name":"Pharmacology, Pharmacognosy and Botany Department, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7644-1759","authenticated-orcid":false,"given":"Adri\u00e1n","family":"Macho-Gonz\u00e1lez","sequence":"additional","affiliation":[{"name":"Nutrition and Food Science Department, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sara","family":"Bastida","sequence":"additional","affiliation":[{"name":"Nutrition and Food Science Department, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2660-5126","authenticated-orcid":false,"given":"Francisco","family":"S\u00e1nchez-Muniz","sequence":"additional","affiliation":[{"name":"Nutrition and Food Science Department, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juana","family":"Bened\u00ed","sequence":"additional","affiliation":[{"name":"Pharmacology, Pharmacognosy and Botany Department, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0615-9149","authenticated-orcid":false,"given":"M.","family":"L\u00f3pez-Oliva","sequence":"additional","affiliation":[{"name":"Departmental Section of Physiology, Pharmacy School, Complutense University of Madrid, 28040 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"9","DOI":"10.17352\/alo.000014","article-title":"Usage of Human Diatomaceous Earth","volume":"8","author":"Mwangi","year":"2023","journal-title":"Ann. 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