Explore our collection of articles and guides in this category.
Quetelet's original BMI formula, why it fails for athletes and different ethnicities, waist-to-height ratio as a better alternative, and body fat percentage comparison.
How BAC is calculated using the Widmark formula, cognitive effects at each BAC level, how breathalyzers work, and legal limits in 20+ countries.
Why 220-age overestimates max HR for 36% of people, the 5-zone model, 80/20 training principle, Zone 2 benefits, and VO2 max estimation.
The Hardy-Weinberg equilibrium explained with cystic fibrosis carrier frequency example, the five conditions for HWE, and population genetics applications.
DEXA vs hydrostatic weighing vs Navy formula vs BIA comparison, healthy body fat ranges by age and sex, and visceral vs subcutaneous fat differences.
WHO 2004 consultation recommending BMI 23 as overweight for Asians, country-specific cutpoints, visceral fat differences, and waist circumference alternatives.
Mifflin-St Jeor vs Harris-Benedict accuracy, activity multipliers for TDEE, why severe caloric restriction slows metabolism, and the Minnesota Starvation Experiment.
Stanford 2023 RCT results, why CO₂ drives breathing (not O₂), box breathing used by Navy SEALs, 4-7-8 for sleep, and Wim Hof blackout risk.
Naegele's Rule, why gestational age counts from LMP, first trimester ultrasound accuracy, ACOG term definitions (39–41 weeks is "full term"), trimester milestones.
Only 12.4% of cycles are 28 days per Apple Women's Health Study, LH strip timing for ovulation prediction, BBT as a lagging indicator, and the sperm-survival fertile window.
INTERHEART study: WHR explained 24.3% of MI risk vs BMI's 7.7%, apple vs pear body shape biology, WHO thresholds by sex, and waist-to-height ratio as a simpler metric.
