Blog
Waist-to-hip ratio: what it is, normal values, and why it beats BMI
Learn how to calculate your waist-to-hip ratio, what normal values are for men and women, and why WHR is a better predictor of health risk than BMI.
Vascular aging: the complete guide to keeping your arteries young
Comprehensive guide to vascular aging — arterial stiffness, endothelial dysfunction, and atherosclerosis. Evidence-based strategies to protect cardiovascular health and slow biological aging.
How accurate is the Apple Watch? What studies say about every health metric
Study-backed Apple Watch accuracy guide for heart rate, VO2 max, SpO2, steps, calories, sleep, HRV, and AFib alerts, with trust rules for health decisions.
HRV trends: how to read your heart rate variability data over time
Learn how to interpret HRV trends on Apple Watch and wearables. Understand what rising or falling heart rate variability means for your health and recovery.
Apple Watch health features for longevity: the complete guide
Complete guide to Apple Watch health features for longevity: HRV, VO2 max, sleep, SpO2, hypertension alerts, accuracy, and biological age trends.
Chronic kidney disease: the aging organ nobody monitors
CKD is often silent until advanced stages. Learn how eGFR, creatinine, cystatin C, and urine albumin reveal kidney aging and cardiovascular risk.
Aortic stiffness and pulse wave velocity: The gold standard of vascular age
Learn how pulse wave velocity reflects aortic stiffness and vascular age, what values mean, how testing works, and which habits may improve arterial health.
Atrial fibrillation and aging: Why your heart rhythm is a longevity signal
AFib rises with age and raises stroke risk. Learn how HRV, sleep apnea, blood pressure, alcohol, and wearables shape heart-rhythm longevity.
Carotid intima-media thickness: Measuring your arterial age directly
CIMT ultrasound measures carotid artery wall thickness, a vascular-aging marker. Learn what results mean, what guidelines say, and how to track risk.