{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T01:37:20Z","timestamp":1792201040936,"version":"4.4.0"},"reference-count":54,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2015,8,31]],"date-time":"2015-08-31T00:00:00Z","timestamp":1440979200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2016,1,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:sec>\n                  <jats:title>\u2003<\/jats:title>\n                  <jats:p>Although caloric restriction (CR) could delay biologic aging in humans, it is unclear if this would occur at the cost of significant bone loss. We evaluated the effect of prolonged CR on bone metabolism and bone mineral density (BMD) in healthy younger adults. Two-hundred eighteen non-obese (body mass index [BMI] 25.1\u2009\u00b1\u20091.7\u2009kg\/m2), younger (age 37.9\u2009\u00b1\u20097.2 years) adults were randomly assigned to 25% CR (CR group, n\u2009=\u2009143) or ad libitum (AL group, n\u2009=\u200975) for 2 years. Main outcomes were BMD and markers of bone turnover. Other outcomes included body composition, bone-active hormones, nutrient intake, and physical activity. Body weight (\u20137.5\u2009\u00b1\u20090.4 versus 0.1\u2009\u00b1\u20090.5\u2009kg), fat mass (\u20135.3\u2009\u00b1\u20090.3 versus 0.4\u2009\u00b1\u20090.4\u2009kg), and fat-free mass (\u20132.2\u2009\u00b1\u20090.2 versus \u20130.2\u2009\u00b1\u20090.2\u2009kg) decreased in the CR group compared with AL (all between group p &amp;lt; 0.001). Compared with AL, the CR group had greater changes in BMD at 24 months: lumbar spine (\u20130.013\u2009\u00b1\u20090.003 versus 0.007\u2009\u00b1\u20090.004\u2009g\/cm2; p &amp;lt; 0.001), total hip (\u20130.017\u2009\u00b1\u20090.002 versus 0.001\u2009\u00b1\u20090.003\u2009g\/cm2; p &amp;lt; 0.001), and femoral neck (\u20130.015\u2009\u00b1\u20090.003 versus \u20130.005\u2009\u00b1\u20090.004\u2009g\/cm2; p\u2009=\u20090.03). Changes in bone markers were greater at 12 months for C-telopeptide (0.098\u2009\u00b1\u20090.012 versus 0.025\u2009\u00b1\u20090.015\u2009\u03bcg\/L; p &amp;lt; 0.001), tartrate-resistant acid phosphatase (0.4\u2009\u00b1\u20090.1 versus 0.2\u2009\u00b1\u20090.1\u2009U\/L; p\u2009=\u20090.004), and bone-specific alkaline phosphatase (BSAP) (\u20131.4\u2009\u00b1\u20090.4 versus \u20130.3\u2009\u00b1\u20090.5\u2009U\/L; p\u2009=\u20090.047) but not procollagen type 1 N-propeptide; at 24 months, only BSAP differed between groups (\u20131.5\u2009\u00b1\u20090.4 versus 0.9\u2009\u00b1\u20090.6\u2009U\/L; p\u2009=\u20090.001). The CR group had larger increases in 25-hydroxyvitamin D, cortisol, and adiponectin and decreases in leptin and insulin compared with AL. However, parathyroid hormone and IGF-1 levels did not differ between groups. The CR group also had lower levels of physical activity. Multiple regression analyses revealed that body composition, hormones, nutrients, and physical activity changes explained \u223c31% of the variance in BMD and bone marker changes in the CR group. Therefore, bone loss at clinically important sites of osteoporotic fractures represents a potential limitation of prolonged CR for extending life span. Further long-term studies are needed to determine if CR-induced bone loss in healthy adults contributes to fracture risk and if bone loss can be prevented with exercise. \u00a9 2015 American Society for Bone and Mineral Research.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1002\/jbmr.2701","type":"journal-article","created":{"date-parts":[[2015,9,2]],"date-time":"2015-09-02T16:16:24Z","timestamp":1441210584000},"page":"40-51","source":"Crossref","is-referenced-by-count":182,"title":["Effect of Two-Year Caloric Restriction on Bone Metabolism and Bone Mineral Density in Non-Obese Younger Adults: A Randomized Clinical Trial"],"prefix":"10.1093","volume":"31","author":[{"given":"Dennis T","family":"Villareal","sequence":"first","affiliation":[{"name":"Baylor College of Medicine and Center for Translational Research on Inflammatory Diseases (CTRID)Michael E DeBakey VA Medical CenterHoustonTXUSA"},{"name":"Department of MedicineWashington University School of MedicineSt. 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DiabetesFlorida Hospital and Sanford Burnham Prebys Medical Discovery InstituteOrlandoFLUSA"},{"name":"Pennington Biomedical Research CenterBaton RougeLAUSA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edward","family":"Saltzman","sequence":"additional","affiliation":[{"name":"Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts UniversityBostonMAUSA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Connie","family":"Bales","sequence":"additional","affiliation":[{"name":"Duke Clinical Research InstituteDurhamNCUSA"},{"name":"Durham VA Medical Center and Duke University Medical CenterDurhamNCUSA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Rochon","sequence":"additional","affiliation":[{"name":"Rho Federal SystemsChapel HillNCUSA"},{"name":"Duke Clinical Research 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