Health on Error Zaphttps://errorzap.com/tags/health/Recent content in Health on Error ZapHugoen-usSat, 06 Jun 2026 00:00:00 +0000Why Your Fitness Tracker's Correlations Are Lying to Youhttps://errorzap.com/posts/why-your-fitness-trackers-correlations-are-lying/Sat, 06 Jun 2026 00:00:00 +0000https://errorzap.com/posts/why-your-fitness-trackers-correlations-are-lying/I built a dashboard that confidently told me walking ruins my sleep — then I learned what a confounder is.