Vitamin-D-Mangel und frühere Sterblichkeit: Warnsignal oder Ursache?
Eher ein Warnsignal. Große Beobachtungsstudien verbinden niedriges Vitamin D mit früherem Tod, Depression und Krebs. Dass Tabletten davor schützen, zeigen diese Daten nicht.
Die kurze Antwort: Aus diesen Studien folgt nicht, dass Vitamin-D-Tabletten Sie schützen. Sie zeigen Zusammenhänge, aber keine Wirkung. Alle hier besprochenen Arbeiten haben einen mittleren Evidenzgrad: Es sind Beobachtungsdaten oder eine Übersicht. Ein niedriger Spiegel weist oft auf Gebrechlichkeit, wenig Bewegung oder Krankheit hin.
Was die Schlagzeilen-Studien finden
Eine japanische Kohortenstudie begleitete 8.285 Erwachsene zwischen 40 und 74 Jahren über 11 Jahre. Im untersten Fünftel lag der Spiegel im Median bei 28,2 nmol/l. Diese Gruppe hatte gegenüber dem obersten Fünftel ein erhöhtes Sterberisiko, mit einer Hazard Ratio von 1,46. US-Registerdaten zu Menschen mit Hörminderung verglichen 48.184 Paare über bis zu 12 Jahre. Bei Werten unter 20 ng/ml lag die Hazard Ratio für Depression bei 1,57. Eine Registeranalyse mit 571.669 Paaren fand für Schilddrüsenkrebs eine Hazard Ratio von 1,41. Bei Sjögren-Syndrom mit Osteoporose ging ein Mangel mit mehr Todesfällen sowie Herz- und Nierenereignissen einher. Brüche traten dort aber nicht häufiger auf.
Warum der Spiegel eher Warnsignal ist
Wer krank, gebrechlich oder viel drinnen ist, hat oft wenig Vitamin D. Der Blutwert misst dann den Gesundheitszustand mit. Die Sjögren-Studie deutet den Mangel selbst als Marker einer Hochrisikogruppe. Die Depressionsstudie betont, dass ihr Design keinen Nutzen eines Ausgleichs belegt. Eine genetische Analyse (Mendelsche Randomisierung) fand: Der Spiegel hat wahrscheinlich keinen großen Effekt auf Wirbelbrüche. Eine Übersichtsarbeit zu Hüftbrüchen berichtet: Präparate hoben den Spiegel zuverlässig. Gehen, Komplikationen, Sterblichkeit und neue Brüche verbesserten sie aber nicht verlässlich.
Die Studien zeigen, dass Vitamin-D-Mangel früher sterben lässt und Tabletten davor schützen.
Beispiel: Was eine Hazard Ratio von 1,46 bedeutet
Beispiel mit angenommenen Werten: Sterben in der Vergleichsgruppe 10 von 100 Menschen in 11 Jahren, entspricht 1,46 vereinfacht etwa 14 bis 15 von 100. Das klingt deutlich. Ohne Ursachennachweis sagt die Zahl aber nicht, ob eine Tablette diesen Abstand verringert.
Leseanleitung: Ursache oder nur Zusammenhang?
- Studienart: Nur randomisierte Studien mit Präparat gegen Placebo prüfen eine Wirkung. Kohorten und Register zeigen Zusammenhänge.
- Endpunkt: Steigt nur der Blutwert – oder auch das, was zählt, etwa Brüche oder Lebenszeit?
- Kontrollen: Gute Registerstudien prüfen Krankheiten ohne plausiblen Bezug. In der Schilddrüsenstudie zeigte Blinddarmentzündung keinen Zusammenhang (Hazard Ratio 1,02).
- Auswahl: Wurde der Spiegel nur bei Menschen gemessen, die ohnehin ärztlich betreut werden?
- Wortwahl: Stehen dort „verbunden mit“ oder „Marker“, beschreibt die Studie keinen Nutzen.
Was die Daten nicht zeigen
Die Befunde schließen kleine Effekte nicht aus; dafür fordern die Forschenden größere Studien. Nach einem Hüftbruch empfiehlt die Übersicht, einen Mangel im Rahmen umfassender Versorgung auszugleichen. Ob und wie viel Sie einnehmen, besprechen Sie bitte ärztlich – besonders bei Vorerkrankungen oder anderen Medikamenten.
Kernaussagen
- Niedriges Vitamin D geht in Beobachtungsstudien mit höherer Sterblichkeit (HR 1,46), Depression (HR 1,57) und Schilddrüsenkrebs (HR 1,41) einher.
- Diese Studien zeigen Zusammenhänge, keine Ursache; der Spiegel spiegelt oft Gebrechlichkeit und Krankheit.
- Eine Mendelsche Randomisierung findet keinen großen kausalen Effekt auf Wirbelbrüche.
- Nach Hüftbruch heben Präparate den Spiegel, verbessern Ergebnisse aber nicht verlässlich.
- Einnahme und Dosis ärztlich besprechen, besonders bei Vorerkrankungen.
Vertiefen Wie hoch und wie oft sollte man Vitamin D bei einem Mangel einnehmen? 
Nächster Schritt Soll ich meinen Vitamin-D-Wert überhaupt messen lassen? 
Querverbindung Warum Abstinente in Studien oft schlechter abschneiden: Ist ein Glas am Tag gesund? Ähnliche Beiträge
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Open-Access-Publikationen mit offener Lizenz, direkt verlinkt.
Plasma 25-hydroxyvitamin D concentrations, vitamin D deficiency and mortality in community-dwelling Japanese adults
Abstract
Blood 25-hydroxyvitamin D (25(OH)D) concentrations vary considerably by season and sex. The present study aimed to determine associations between vitamin D deficiency and mortality in Japanese adults and identify risk thresholds according to 25(OH)D concentrations. This was a cohort study with an 11-year follow-up. Participants were 8285 community-dwelling Japanese adults aged 40-74 years. Plasma 25(OH)D concentrations were measured by chemiluminescent immunoassay at baseline and divided into quintiles for each of the subgroups stratified by season and sex (denoted as season- and sex-stratified quintiles). The main outcome was all-cause mortality. Hazard ratios (HR) were calculated using a Cox proportional hazards model. Mean age and 25(OH)D concentration were 59·9 years (sd = 9·1) and 50·1 nmol/l (sd = 18·1), respectively. Lower season- and sex-stratified quintiles were associated with higher hazards of all-cause mortality (<i>P</i><sub>for trend</sub> = 0·0015), with the first quintile (median = 28·2 nmol/l) having a higher HR (HR = 1·46, 95 % CI, 1·13, 1·88) than the highest quintile (reference). When crude quintiles were used, the overall association was similar (<i>P</i><sub>for trend</sub> = 0·0027), with the first (median = 28·0 nmol/l) and second (median = 39·7 nmol/l) quintiles having higher HR (HR = 1·40, 95 % CI, 1·06, 1·85 and 1·38, 95 % CI, 1·07, 1·77, respectively) than the reference. The risk threshold difference was estimated to be approximately 10 nmol/l. In
Association of vitamin D deficiency with incident depression in patients with hearing impairment: an observational retrospective cohort study
Abstract
<h4>Background</h4>Hearing impairment is associated with an elevated risk of depression, yet modifiable risk factors in this population remain poorly characterized. Although vitamin D deficiency (VDD) has been linked to depression in general populations, no large-scale study has examined this association among adults with hearing impairment.<h4>Methods</h4>This retrospective cohort study used the TriNetX Global Collaborative Network. Adults aged ≥18 years with hearing impairment who underwent serum 25-hydroxyvitamin D [25(OH)D] testing between 2010 and 2023 were classified into VDD (< 20 ng/ml) and sufficiency (≥30 ng/ml) cohorts. Thus, the study population represented a selected healthcare-utilizing cohort with available vitamin D measurements. After propensity score matching (48,184 per group), Cox models estimated hazard ratios (HRs) for incident depression over 12 years using a 1-year landmark design.<h4>Results</h4>For the primary outcome, VDD was associated with a significantly higher risk of overall depression (<i>HR</i>, 1.57; 95% <i>CI</i>, 1.51-1.64; <i>P</i> < 0.001). For secondary outcomes, significant associations were observed for depressive episode (<i>HR</i>, 1.60), recurrent depression (<i>HR</i>, 1.62), suicidal behavior/self-harm (<i>HR</i>, 1.47), and all-cause mortality (<i>HR</i>, 1.40; all <i>P</i> < 0.001). The associations remained robust across sensitivity analyses (<i>HRs</i>, 1.55-1.65). Subgroup analyses showed consistent associations across sex,
Pre-diagnostic vitamin D deficiency and subsequent thyroid cancer risk: a propensity-matched cohort study
Abstract
<h4>Background</h4>Vitamin D deficiency (VDD) has been implicated as a potential risk factor for thyroid cancer; however, existing evidence is derived primarily from case-control or cross-sectional studies. This study aimed to examine the association between pre-diagnostic VDD and the risk of incident thyroid cancer over a 10-year follow-up period.<h4>Methods</h4>This retrospective propensity score-matched cohort study used the TriNetX Global Collaborative Network. Adults aged ≥ 18 y with serum 25-hydroxyvitamin D [25(OH)D] measurements between 2010 and 2023 were classified as having VDD (<20 ng/mL) or vitamin D sufficiency (≥30 ng/mL). One-to-one propensity score matching was performed on demographics, comorbidities, thyroid-related disorders, laboratory values, and vitamin D supplementation. The primary outcome was incident thyroid cancer ascertained ≥ 180 day after the index date (landmark approach) over 10 y of follow-up. Positive (osteoporotic fracture) and negative (appendicitis, goiter) control outcomes and thyroid procedure utilization were evaluated to assess detection bias.<h4>Results</h4>After matching, 571,669 pairs were analyzed over a median follow-up of 6.8 y. VDD was associated with an increased risk of incident thyroid cancer (HR: 1.41; 95% CI: 1.32, 1.50), and this risk was attenuated among patients with vitamin D insufficiency (25[OH]D 20-30 ng/mL; HR: 1.27; 95% CI: 1.20, 1.34), demonstrating a dose-dependent relationship. Thyroid biopsy and ultrasonography
Association of Vitamin D Deficiency with Mortality and Cardiorenal Events in Sjögren's Syndrome and Osteoporosis
Abstract
<b>Background:</b> Sjögren's syndrome (SjS) is a chronic systemic autoimmune disease associated with substantial extraglandular morbidity, including osteoporosis, cardiovascular disease, and renal involvement. Vitamin D deficiency (VDD) is highly prevalent in patients with SjS and has been linked to immune dysregulation, systemic inflammation, and adverse cardiorenal outcomes in other clinical settings. However, the prognostic significance of VDD in patients with SjS and osteoporosis remains incompletely characterized. <b>Methods:</b> We conducted a retrospective cohort study using de-identified electronic health records from the TriNetX research network between 2010 and 2024. Adult patients with SjS and osteoporosis who had at least one serum 25-hydroxyvitamin D measurement within six months before or after cohort entry were included. VDD was defined as a serum 25-hydroxyvitamin D concentration below 20 ng/mL, and vitamin D adequacy (VDA) as a concentration of 30 ng/mL or higher. Propensity score matching was performed at a 1: 1 ratio using 95 baseline covariates. The primary outcome was all-cause mortality. Secondary outcomes included major adverse cardiovascular events (MACEs), major adverse kidney events (MAKEs), and fractures. <b>Results:</b> Among 19,177 eligible patients, 1218 with VDD and 7659 with VDA met the inclusion criteria. After propensity score matching, 1067 well-balanced pairs were analyzed. Over five years of follow-up, VDD was associated with higher risks
Circulating serum 25-hydroxyvitamin D levels and bone mineral density and osteoporotic vertebral fractures: A Mendelian randomization study
Abstract
<h4>Background and objectives</h4>Low serum 25-hydroxyvitamin D (25OHD) has been associated with osteoporosis and osteoporotic fracture, but whether these associations are causal remains unclear.<h4>Methods</h4>We identified 15 single-nucleotide polymorphisms (SNPs) affecting serum 25OHD levels in seven genes in the peripheral blood genomic deoxyribonucleic acid (DNA) of 2061 community-based people aged 20-92 years (711 men and 1350 women) and 200 outpatients aged 55-85 years with vertebral fractures (36 men and 164 women). Our study employs Mendelian randomization (MR) to determine the causal relationship between serum 25OHD concentration and bone mineral density (BMD), bone turnover markers (BTMs), and vertebral fracture.<h4>Results</h4>MR analysis indicated no correlation between hereditary 25OHD levels and BMD, procollagen type 1 N-terminal propeptide (P1NP), carboxy-terminal telopeptide of type 1 collagen (CTX), and vertebral fractures (all <i>P</i> > 0.05) in all participants. In participants aged 55-92 years, MR analysis revealed that low serum 25OHD levels (odds ratio [OR] = 1.38; 95% confidence interval [CI]: 1.07-1.79; <i>P</i> = 0.014) are causally associated with increased P1NP levels. In sensitivity analysis, MR-Egger regression and the Weighted-median estimator indicated no significant pleiotropy.<h4>Conclusions</h4>Our findings suggest that baseline 25OHD levels are unlikely to have a large effect on risk of vertebral fractures. Larger MR studies and randomized
Vitamin D Deficiency in Hip Fracture Patients: Outcome-Specific Associations and Post-Fracture Management-A Narrative Review
Abstract
<i>Background and Objectives:</i> Vitamin D deficiency is common in older adults with hip fracture and has been associated with adverse postoperative outcomes. However, heterogeneity in deficiency thresholds, outcome definitions, and patient populations has complicated the interpretation and clinical application of existing evidence. This narrative review aimed to summarize current evidence regarding perioperative vitamin D status, its associations with postoperative complications, mortality, functional recovery, and secondary fracture, and the role of vitamin D supplementation after hip fracture. <i>Materials and Methods:</i> Relevant studies were identified through PubMed searches and manual screening of reference lists. Cohort studies, randomized controlled trials, systematic reviews, meta-analyses, and clinical guidelines addressing vitamin D status, supplementation, hip fracture outcomes, fracture prevention, or postoperative recovery in older adults were narratively synthesized. <i>Results:</i> Low serum 25-hydroxyvitamin D was associated with selected early medical complications, mortality, impaired functional recovery, and secondary hip fracture, although these associations varied across outcomes. The strongest prognostic associations with mobility were observed in patients with severe deficiency (approximately ≤10-12 ng/mL), whereas mild insufficiency showed less consistent associations. Heterogeneity among studies reflected differences in deficiency thresholds, samp
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Medizinische Prüfung: Dr. med. Anna Reuter, Fachärztin für Innere Medizin, 25. März 2026.
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