Biomarkers Without Felt Benefits

An at‑home randomized trial finds mouth taping raises heart rate variability (a recovery marker) by about 2 milliseconds on average, yet participants don’t report better sleep. This suggests interventions can improve physiological recovery without users noticing in the short term. It challenges the habit of treating 'I feel better' as the sole yardstick for wellness hacks and therapies. — Policy, payers, and media should weigh both biomarkers and patient reports when judging health interventions, especially as wearables spread.