#health
9 articles
One 90 mg Coffee Needs 2.5 to 6.8 Hours Before Bed to Drop Under 50 mg. Your Half-Life Decides Which
Caffeine's half-life ranges from 1.5 to 9.5 hours between healthy adults, per the Institute of Medicine. We ran one filter coffee and a double through the half-life math at 3, 4, 5, 6 and 8 hours to see how far back your cutoff really needs to be.
6 Hours/Night Costs Kevin $14,500/Year (and 1-2 Years of Lifespan)
Kevin's $95K salary at 6 hours of sleep: ~12% productivity loss + $1,800 healthcare + 2-3 extra sick days = ~$14K/year cash cost. Plus a measurable lifespan reduction the dollar framing can't capture.
The Baseline Water Recommendation Is 30ml Per Kilogram of Body Weight — Exercise, Climate, and Caffeine All Add More
The European Food Safety Authority's base figure is just the starting point. We broke down what exercise, hot climates, and caffeine each actually add on top of it, per ACSM, WHO, and Mayo Clinic guidance.
One Sugary Drink a Day (~150 Calories) Adds Up to Roughly 7kg of Weight Gain a Year, if Nothing Else Changes
The 3,500-calorie-per-pound rule is a simplification, but it's a useful one for seeing how a small daily habit compounds — both in weight and in the money spent on it, year after year.
Sitting 8+ Hours a Day Raises All-Cause Mortality Risk by ~20% — Standing Breaks Every 30 Minutes Cut That by ~17%
A 2016 Lancet study put a number on prolonged sitting's health cost. Separate Columbia University research found a simple, low-effort intervention — regular standing breaks — meaningfully offsets it.
Regular Exercise Cuts Healthcare Costs by an Estimated $2,500/Year — And Adds ~2 Hours of Life Per Hour Exercised
The ACSM's healthcare-savings figure and Harvard's life-expectancy estimate are two very different ways of pricing the same habit. We ran both against the actual cost of a gym membership.
BMI Was Built in the 1830s to Describe the 'Average Man' — Not to Diagnose Any Individual
Adolphe Quetelet designed it for population-level epidemiology, and the WHO adopted it decades later for exactly that scale. For any one person, it's a useful first-pass signal with real blind spots.
Waking Up Mid-Cycle Feels Worse Than Sleeping Less — the AASM's 90-Minute Cycle Explains Why
Sleep science consensus puts a full cycle at roughly 90 minutes: light, deep, REM. Timing wake-up to land at a cycle boundary, rather than mid-deep-sleep, changes how rested you feel independent of total hours.
A 500-Calorie Daily Deficit Doesn't Mean 500 Divided by 7,700 kg a Day Forever — Your BMR Keeps Recalculating
The Mifflin-St Jeor equation (1990) plus the Wishnofsky 7,700 kcal/kg conversion form the standard weight-projection model — but BMR shrinks as weight drops, which is why simple linear extrapolations overshoot.