The magazine of preventive health and longevity.
Sourced, fact-checked articles written by doctors and experts, to understand, prevent and act every day.
Thymus: how this immune organ atrophies with age
The thymus, where T lymphocytes are trained, starts to atrophy in the first year of life and fills with fat. Here is what studies show about its decline and the habits linked to slower atrophy.
Most recent
Anemia: what hemoglobin levels are normal by age and sex?
Constipation after 60: 6 proven causes and when to see a doctor
Hypothyroidism: What TSH Is Really Normal After 60?
Shingles: 5 proven facts about the risk after 50 and the vaccine
CRP levels: normal range by age and what a high result signals
CRP levels rise within hours with infection and slowly with age. Here are the normal thresholds by age and sex, what a…
Knee cartilage: what exercise really does to its wear and tear
Does exercise wear out knee cartilage? MRI studies and large cohorts of runners show that moderate activity nourishes it, while injuries, excess…
Calcium score: what this number reveals about your arteries by age
A calcium score of 0, 100 or 400 does not mean the same thing at 45 and at 75. Here is what…
Magnesium threonate: what is proven, dose and precautions
Magnesium threonate was designed to raise brain magnesium. Here is what six human trials on memory and sleep really show, the dose…
Uric Acid: Normal Levels by Age and Sex, and When to See a Doctor
Normal uric acid ranges from 210 to 420 µmol/L in men and 150 to 350 µmol/L in women before menopause. Here is…
Climbing stairs: how every floor works on your heart
Climbing stairs pushes the heart rate to nearly 160 beats per minute in about ten floors. Here is what 11 studies show…
Resting heart rate: the normal value for your age and sex
What is a normal resting heart rate? Figures by age and sex from 35,302 people, the thresholds that call for medical advice,…
Leucine: how much, when and who should take it
Leucine is the amino acid that switches on muscle building. Here is how much older adults need per meal, when to eat…
Hyperbaric chamber: what the science really says about aging
A 2020 study reported telomeres lengthened by more than 20% after hyperbaric chamber sessions. Here is what the trials really show about…