New Hair Test Maps Your Body Clock with Near-Perfect Accuracy
A new hair-based test has been developed to determine a person's internal body clock. Using just 17 genes from hair follicle cells, the test maps an individual's circadian rhythm with near-saliva-test accuracy. Researchers say it could revolutionise how treatments are timed for better results and fewer side effects. The test, called Haar-Test, analyses gene activity in hair follicles to identify when a person's body naturally peaks in alertness or fatigue. Machine learning processes this data to create a precise chronotype profile. Over 4,000 people have already taken the test, confirming its reliability.
Research shows clear differences in internal clocks across groups. People in their mid-20s tend to stay awake about an hour later than those over 50. Women's bodies signal the start of 'biological night' roughly six minutes earlier than men's. Employed individuals also run on a clock around 30 minutes ahead of those without jobs. The team behind the test is now working to standardise it for routine lab use. While no studies yet prove its effectiveness in real-world drug timing, the method opens doors for **chronotherapeutics**—treatments adjusted to a patient's personal rhythm. Unlike saliva tests, this approach is simpler and nearly as precise. If successful, the test could make 'timed' healthcare a reality. Doctors might soon prescribe medicines or therapies at moments when a patient's body is most receptive.
The hair-based test offers a practical way to measure circadian rhythms without complex procedures. Its potential to improve treatment timing could reduce side effects and boost effectiveness. With further standardisation, it may soon become a common tool in medical care.
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