Is Leaky Gut Test useful for longevity?

The usefulness of a leaky gut test for longevity is not supported by strong evidence. The concept of 'leaky gut' (increased intestinal permeability) is controversial, and no standardized, validated test reliably diagnoses it in otherwise healthy individuals. Most commercial tests measure markers like zonulin or LPS, but their predictive value for longevity is unproven. While increased permeability may be associated with chronic inflammation, a direct causal link to lifespan is lacking. For longevity, focus on validated biomarkers such as inflammatory markers (CRP), lipid profile, blood glucose, and microbiome diversity. A leaky gut test without medical indication may lead to unnecessary dietary restrictions or anxiety. Evidence grade: marketing/unclear. Caveat: Do not replace professional medical advice with unvalidated tests.