Blog
How weather relates to how people feel — explained calmly, with sources. Informational material, not medical advice.
Kidney stones in hot weather: what research says about heat, dehydration and drinking water
Kidney stones in hot weather: studies tie hot, humid days to more doctor visits for stones. What is known about dehydration and drinking water, and what is not.
Ideal humidity for home: where the 40–60% figure comes from and what it covers
Ideal humidity for home: the 40–60% range is a 1986 compromise between mites, mold and viruses, not a tested threshold. What dry air and dampness are linked to.
Sick building syndrome and air conditioning: what office studies found about headaches, dryness and tiredness
Sick building syndrome in air-conditioned offices: what six studies and reviews link to headaches, tiredness and a dry throat, what they did not test, and what to track yourself.
Why am I so tired after working out? Sleep, HRV and what three studies show
Why am I so tired after working out when the same session felt easy last week? What studies say about sleep loss, heart rate variability and why one morning number is not a verdict.
Sedentary lifestyle: what the WHO guidelines and accelerometer data say
What counts as a sedentary lifestyle by WHO numbers, why there is no hours-per-day limit for sitting, and what 36,383 people wearing accelerometers showed about activity and mortality.
Can exercise make you sick? Where the exercise and immunity debate stands
Can exercise make you sick? A marathon survey, the open window theory and a debate paper by both camps: what exercise and immunity research agrees on, and what is still unresolved.
Cycle syncing workouts: what two reviews found about training by menstrual phase
Cycle syncing workouts, planning training around menstrual phases, are popular. What a 78-study meta-analysis and an umbrella review found, and why the authors reject general rules.
Best temperature for sleep: what research says about bedroom heat, cold and AC at night
Best temperature for sleep: the studies give no single bedroom number. What they say about bedding, humid heat, sleeping with AC on all night and cold rooms in winter.