Anemia
How Much Iron Do You Actually Need? Ages, Sex, and What Ferritin Means
Ferritin comes back at 14 ng/mL and the doctor says your iron is low. Nothing else in the report is abnormal. The haemoglobin is fine, the red cell s…
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Circadian Rhythm
How Much Sleep Per Night? What Your Age Actually Changes
Every health app compares your night to a number invented before sleep labs had dashboards. Eight hours is folklore with good marketing: no consensus…
Health
The Best Time for Your Flu Shot: Why October, Not July
Public-health deadlines are rare, and this one has an unusual problem: everyone quotes the date and almost nobody quotes the reasoning. The CDC's…
Blood Sugar
How Much Added Sugar Per Day? The 50 g Label and the 25 g Goal
Added sugar is the one line on the Nutrition Facts panel that ships with a printed maximum, which sounds simple until three authorities hand you thre…
Fitness
How Many Steps Per Day Do You Actually Need? The 7,000 Number
The most repeated health number in the English language is also the one with the least paperwork behind it. Ten thousand steps a day shows up on wris…