{"count":5,"index":{"built_at":"2026-07-27T06:12:47.424970+00:00","public_records":55311,"revision":"56f51ffa992123a6ed85be27"},"query":{"area":null,"kind":null,"lang":null,"limit":10,"match_mode":"all_terms","q":"Evidence check: VDR in the context of Schlaf"},"results":[{"answer":"The provided context does not include specific information on VDR (vitamin D receptor) and sleep. Therefore, this answer is based on general scientific knowledge. VDR polymorphisms (e.g., rs2228570, rs1544410) have been associated in studies with sleep quality, duration, and disorders like insomnia, likely via circadian rhythm regulation and vitamin D metabolism. However, the evidence is moderate and inconsistent: some studies show associations, others do not. Effect sizes are small and confounded by environmental factors (sun exposure, diet). A single DNA test cannot reliably predict individual sleep patterns. Clinically relevant sleep issues should be evaluated by a physician. Evidence grade: human-moderate (GWAS, but replicated).","area":"gesundheit","canonical_id":"gesundheit:canonical-6871f8c336bb8dcf4cd6558e","id":"public-1b693a644dc212681095c979","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: VDR in the context of Schlaf","score":20.00138797,"snippet":"The provided context does not include specific information on VDR (vitamin D receptor) and sleep. Therefore, this answer is based on general scientific knowledge. VDR polymorphisms (e.g., rs2228570, rs1544410) have been associated in studies with sleep quality, duration, and disorders like insomnia, likely via circadian rhythm regulation and vitamin D metabolism. However, the evidence is moderate and inconsistent: some studies show associations, others do not. Effect sizes are small and confounded by environmental factors (sun exposure, diet). A single DNA test cannot reliably predict individual sleep patterns. Clinically relevant sleep issues should be evaluated by a physician. Evidence gra","sources":[],"title":"Evidence check: VDR in the context of Schlaf","url":"https://tikki.wiki/wissen/gesundheit/frage/public-1b693a644dc212681095c979/evidence-check-vdr-in-the-context-of-schlaf/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The SLIM DNA-Test (or similar weight-loss genetic tests) often claims personalized recommendations based on variants like FTO, MC4R, or VDR. However, the scientific evidence is limited: FTO rs9939609 (A allele) is associated with higher BMI (GWAS p=4e-51), but the effect per allele is only ~0.3 BMI units. A direct impact on sleep quality or chronotype is not established – only an indirect link via sleep apnea in severe obesity. VDR variants affect vitamin D metabolism, and low vitamin D is linked to poorer sleep, but a causal effect on circadian rhythm is lacking. The Mediterranean-fiber diet, in contrast, shows robust human evidence for weight loss, reduced inflammation, and improved microbiome diversity – independent of genotype. Bottom line: A DNA test alone is insufficiently validated for weight loss and sleep. More actionable are biomarkers like HbA1c, hs-CRP, or blood vitamin D levels. Evidence is mixed: mechanistic and observational, but not strong enough for clinical recommendations.","area":"gesundheit","canonical_id":"gesundheit:canonical-82acd24271d458c7aa5edf5f","id":"public-0e07f7d7130aa4895e835326","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: WeightLoss | SLIM DNA-Test in the context of Schlaf","score":18.91402751,"snippet":"The SLIM DNA-Test (or similar weight-loss genetic tests) often claims personalized recommendations based on variants like FTO, MC4R, or VDR. However, the scientific evidence is limited: FTO rs9939609 (A allele) is associated with higher BMI (GWAS p=4e-51), but the effect per allele is only ~0.3 BMI units. A direct impact on sleep quality or chronotype is not established – only an indirect link via sleep apnea in severe obesity. VDR variants affect vitamin D metabolism, and low vitamin D is linked to poorer sleep, but a causal effect on circadian rhythm is lacking. The Mediterranean-fiber diet, in contrast, shows robust human evidence for weight loss, reduced inflammation, and improved microb","sources":[],"title":"Evidence check: WeightLoss | SLIM DNA-Test in the context of Schlaf","url":"https://tikki.wiki/wissen/gesundheit/frage/public-0e07f7d7130aa4895e835326/evidence-check-weightloss-slim-dna-test-in-the-context-of-schlaf/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The question about typical costs for a 'Schlaf Check' cannot be answered from the provided context. The given knowledge snippets only discuss genetic variants (e.g., TAS2R38, VDR, NQO1) and their potential links to metabolism or sleep, but contain no pricing or product information. A 'Schlaf Check' might include DNA analysis, biomarker testing, or questionnaires, depending on the provider (e.g., MyBody-X), and costs can vary widely. Without specific product details or regional pricing, a reliable cost estimate is not possible. I recommend checking the provider's official website or contacting them directly for current prices. The evidence level is 'unclear' because the context lacks any relevant data.","area":"gesundheit","canonical_id":"gesundheit:canonical-22532e39eed98833949744d7","id":"public-0279ffd25aa815bbdb54c0a0","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Typical costs related to Schlaf Check","score":18.09722328,"snippet":"The question about typical costs for a 'Schlaf Check' cannot be answered from the provided context. The given knowledge snippets only discuss genetic variants (e.g., TAS2R38, VDR, NQO1) and their potential links to metabolism or sleep, but contain no pricing or product information. A 'Schlaf Check' might include DNA analysis, biomarker testing, or questionnaires, depending on the provider (e.g., MyBody-X), and costs can vary widely. Without specific product details or regional pricing, a reliable cost estimate is not possible. I recommend checking the provider's official website or contacting them directly for current prices. The evidence level is 'unclear' because the context lacks any rele","sources":[],"title":"Typical costs related to Schlaf Check","url":"https://tikki.wiki/wissen/gesundheit/frage/public-0279ffd25aa815bbdb54c0a0/typical-costs-related-to-schlaf-check/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The question about myths vs facts regarding fertility checks and sleep is not directly addressed in the provided context. The context contains information on DNA tests for single genes (FADS1, HLA-DQA1, APOE, VDR, MCM6) and their limited predictive power. For fertility and sleep, no specific study data are present in this context. In general, fertility checks based on single genetic variants have low predictive value because fertility is multifactorial (hormones, age, lifestyle). Sleep is known to influence hormones like melatonin and cortisol, which can modulate fertility. Myths such as 'a genetic test can tell you exactly when you will conceive' are not scientifically supported. Facts: adequate sleep (7–9 h) and a healthy lifestyle are more important than isolated genetic variants. The evidence from the context is weak; therefore the rating is 'unclear'. No specific sources from the context are available.","area":"gesundheit","canonical_id":"gesundheit:canonical-6f919faccf4363afb86886c5","id":"public-61845267e1fb661b3b39bb4c","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Myths vs facts: Fertility Check and Schlaf","score":17.93997394,"snippet":"The question about myths vs facts regarding fertility checks and sleep is not directly addressed in the provided context. The context contains information on DNA tests for single genes (FADS1, HLA-DQA1, APOE, VDR, MCM6) and their limited predictive power. For fertility and sleep, no specific study data are present in this context. In general, fertility checks based on single genetic variants have low predictive value because fertility is multifactorial (hormones, age, lifestyle). Sleep is known to influence hormones like melatonin and cortisol, which can modulate fertility. Myths such as 'a genetic test can tell you exactly when you will conceive' are not scientifically supported. Facts: ade","sources":[],"title":"Myths vs facts: Fertility Check and Schlaf","url":"https://tikki.wiki/wissen/gesundheit/frage/public-61845267e1fb661b3b39bb4c/myths-vs-facts-fertility-check-and-schlaf/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The question of a Vitamin D test in the context of sleep is legitimate, but the evidence requires careful differentiation. Observational studies show associations between low vitamin D levels (25-hydroxyvitamin D) and sleep disturbances such as shortened sleep duration, poorer sleep quality, and increased daytime sleepiness. However, causality is not clearly established: randomized controlled trials (RCTs) of vitamin D supplementation show mixed results, and effects on sleep are generally small or non-significant. A blood test for 25(OH)D is the clinical standard for assessing vitamin D status. Direct-to-consumer genetic tests for variants in genes like VDR, GC, or CYP2R1, which influence vitamin D metabolism, are not validated for sleep assessment. The associations are weak and polygenic, with low individual predictive power. Moreover, routine vitamin D screening in the general population without specific risk factors is not recommended by guidelines (e.g., US Preventive Services Task Force). For individuals with sleep issues, it is more appropriate to measure 25(OH)D via blood test if deficiency is suspected (e.g., dark skin, low sun exposure, obesity). A genetic test provides no added value. Conclusion: Vitamin D tests (blood) can be useful in individual cases, but the evidence for a causal link with sleep is moderate. Genetic tests are not indicated.","area":"gesundheit","canonical_id":"gesundheit:canonical-76249b22b82e1eeadc56c224","id":"public-9c9d31cda6223222c7fca60b","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Vitamin D Test in the context of Schlaf","score":17.76357997,"snippet":"The question of a Vitamin D test in the context of sleep is legitimate, but the evidence requires careful differentiation. Observational studies show associations between low vitamin D levels (25-hydroxyvitamin D) and sleep disturbances such as shortened sleep duration, poorer sleep quality, and increased daytime sleepiness. However, causality is not clearly established: randomized controlled trials (RCTs) of vitamin D supplementation show mixed results, and effects on sleep are generally small or non-significant. A blood test for 25(OH)D is the clinical standard for assessing vitamin D status. Direct-to-consumer genetic tests for variants in genes like VDR, GC, or CYP2R1, which influence vi","sources":[],"title":"Evidence check: Vitamin D Test in the context of Schlaf","url":"https://tikki.wiki/wissen/gesundheit/frage/public-9c9d31cda6223222c7fca60b/evidence-check-vitamin-d-test-in-the-context-of-schlaf/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}}],"schema_version":"tikki.search-response.v1"}