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Find health guides and all information on metabolic health to feed the curious you.

How the Ultrahuman Ring identifies light, deep and REM sleep from pulse, movement and skin temperature, and how to read the results.

What REM sleep is, what it does, how much is normal by age, and the most common cause of lost REM

Going to bed after midnight can still leave you tired, even with a full night's sleep. It's all to go with your circadian rhythm

VO2 max measures how well your body uses oxygen during hard exercise, and it's one of the strongest predictors of long-term health there is.

Ultrahuman's VO2 max estimate is now calibrated directly against lab testing (CPET). Here's what's new, and why your score may change.

VO2 max is one of the strongest known predictors of long-term health – but almost nobody gets it lab-tested. Here's what a good score looks like by …

Snoring is treated like a joke – but it's an early, physical signal of airway health. Here's what it actually means, and what to do about it.

If you're looking to choose low calorie drinks, then follow our guide to best spirits and mixers

We explain the difference between RMSSD vs SDNN for measuring HRV, and which is best for understanding your health