{"count":2,"index":{"built_at":"2026-07-27T00:17:29.636224+00:00","public_records":55311,"revision":"64761395f97214f0e76c8a70"},"query":{"area":null,"kind":null,"lang":null,"limit":10,"match_mode":"all_terms","q":"Evidence check: CYP1A2 in the context of Sport"},"results":[{"answer":"CYP1A2 is the primary enzyme responsible for caffeine metabolism. The common variant rs762551 (often called *1F) classifies individuals as fast (AA) or slow (AC/CC) metabolizers. In sports, it is hypothesized that fast metabolizers gain greater ergogenic benefit from caffeine, while slow metabolizers may face increased side effects like palpitations or sleep disruption. However, the evidence is mixed: some studies report improved endurance performance in AA homozygotes, but others find no genotype-dependent effect. Additionally, CYP1A2 activity is influenced by smoking, medications, and diet, which limits the predictive value of a single DNA test. Recent reviews (e.g., PMID: 30926990) conclude that current data do not support personalized caffeine dosing based solely on CYP1A2 genotype. For consumers, this means the test may offer a suggestive clue but not a reliable action plan. Safety note: high caffeine intake can be harmful regardless of genotype. Evidence: mixed.","area":"gesundheit","canonical_id":"gesundheit:canonical-9bdca18f99f4723fb8929a39","id":"public-0729eed5b7f593255da7db0b","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: CYP1A2 in the context of Sport","score":23.35083017,"snippet":"CYP1A2 is the primary enzyme responsible for caffeine metabolism. The common variant rs762551 (often called *1F) classifies individuals as fast (AA) or slow (AC/CC) metabolizers. In sports, it is hypothesized that fast metabolizers gain greater ergogenic benefit from caffeine, while slow metabolizers may face increased side effects like palpitations or sleep disruption. However, the evidence is mixed: some studies report improved endurance performance in AA homozygotes, but others find no genotype-dependent effect. Additionally, CYP1A2 activity is influenced by smoking, medications, and diet, which limits the predictive value of a single DNA test. Recent reviews (e.g., PMID: 30926990) conclu","sources":[],"title":"Evidence check: CYP1A2 in the context of Sport","url":"https://tikki.wiki/wissen/gesundheit/frage/public-0729eed5b7f593255da7db0b/evidence-check-cyp1a2-in-the-context-of-sport/","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 'Fitness or Lifestyle Check' in the context of gut health is scientifically challenging. The provided contexts show that many commercial tests – such as food intolerance tests (IgG) or genetic analyses for longevity (e.g., SIRT1) – rely on weak or purely mechanistic evidence. For concrete fitness or lifestyle recommendations based on the microbiome, there are currently no validated, clinically proven biomarkers. The evidence for SNP-based claims (e.g., MTHFR, CYP1A2) is mostly associative and not predictive for individual training or dietary adjustments. A microbiome test can give rough indications of bacterial composition, but cannot tell whether you tolerate certain sports better or how to optimize your diet. The overall evidence is best classified as 'marketing': the promises far exceed the scientific basis. Consumers should not rely on such test results but instead seek medical advice and established methods (e.g., elimination diet, blood work). Without robust clinical trials, the benefit for fitness and lifestyle remains speculative.","area":"gesundheit","canonical_id":"gesundheit:canonical-45898c19596acde5a49835ba","id":"public-18b9ba5b8b3dcb71aacb4690","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Fitness | LifestyleCheck in the context of gut health","score":20.07302377,"snippet":"The question of a 'Fitness or Lifestyle Check' in the context of gut health is scientifically challenging. The provided contexts show that many commercial tests – such as food intolerance tests (IgG) or genetic analyses for longevity (e.g., SIRT1) – rely on weak or purely mechanistic evidence. For concrete fitness or lifestyle recommendations based on the microbiome, there are currently no validated, clinically proven biomarkers. The evidence for SNP-based claims (e.g., MTHFR, CYP1A2) is mostly associative and not predictive for individual training or dietary adjustments. A microbiome test can give rough indications of bacterial composition, but cannot tell whether you tolerate certain sport","sources":[],"title":"Evidence check: Fitness | LifestyleCheck in the context of gut health","url":"https://tikki.wiki/wissen/gesundheit/frage/public-18b9ba5b8b3dcb71aacb4690/evidence-check-fitness-lifestylecheck-in-the-context-of-gut-health/","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"}