HAVIT Blog
Guides fondés sur la science pour les habitudes, le sommeil, la nutrition et le mouvement.
Récents · 98 articles
How to Track Soluble vs Insoluble Fiber Intake: The Ratio That Actually Matters for Gut Health
Tracking fiber type diversity—not just total grams—can improve gut health outcomes by up to 40% compared to generic fiber targets.
Food Combination Glucose Response: A 14-Day CGM Pairing Experiment Protocol
A structured 14-day protocol to test which food pairing strategies actually flatten your personal glucose curves using CGM data.
How Inaccurate Is Calorie Tracking Without Weighing Food? The Hidden Math of Portion Estimation
Visual portion estimation typically leads to 30-50% calorie underreporting, but specific training techniques can reduce this error to under 15%.
Why Your Food Log Is Lying to You: The Science of Portion Estimation Error
Studies reveal systematic underreporting of 30-50% in food logs, but specific techniques like weighing foods and photo documentation can cut errors by half.
Garmin Body Battery Algorithm Validation: What Cortisol and Stress Research Actually Shows in 2026
Body Battery shows moderate correlation (r=0.52-0.61) with cortisol patterns, but works best as a trend tracker rather than a precise stress meter.
Garmin Fenix 8 Training Load ACWR Accuracy: How Close Does It Get to Research Thresholds?
Garmin Fenix 8's ACWR tracks within 8-12% of research-validated thresholds, with best accuracy in running and cycling but notable gaps in swimming metrics.
Garmin Forerunner 970 Running Power Accuracy vs Stryd: Real-World Comparison Across Terrain
The Forerunner 970 tracks flat-ground power within 3-4% of Stryd, but gaps widen to 8-12% on steep hills and technical terrain.
Garmin HRV Status and the 7-Day Baseline: When to Adjust Training and When to Ignore It
Your Garmin HRV status compares today against a 7-day rolling baseline—but knowing when that comparison matters for training decisions is what separates useful data from anxiety-inducing numbers.
Why Your 3 PM Brain Fog Might Show Up on a Glucose Graph First
Post-meal glucose drops below 70 mg/dL correlate with measurable cognitive decline 30-90 minutes later—CGM tracking can help you spot the pattern before the fog hits.
Why Your 'Healthy' Oatmeal Might Spike Your Blood Sugar More Than a Cookie
CGM studies show 'healthy' foods like oatmeal and bananas spike glucose more than cookies in nearly half of non-diabetics—your body's response is uniquely yours.
Heart Rate Recovery After Exercise: The 60-Second Fitness Test You're Probably Ignoring
Your heart rate drop in the first 60 seconds after exercise predicts cardiovascular health better than how fast you ran.
Heart Rate Zone Training: Why Your Watch's Zones Are Probably Wrong (And How to Fix Them)
Generic heart rate formulas miss the mark for most people—here's how to calculate zones that actually match your physiology using proven threshold methods.