How many sauna sessions per week produce health benefits?
Even 2 to 3 sessions per week is associated with measurable health benefits; those who go 4 or more times appear to benefit even more, though in practice most people do not reach that frequency.
Even at 2 to 3 sessions per week, large long-running observational studies show lower rates of high blood pressure, cardiovascular disease, and premature death. At 4 or more sessions per week the effect is larger, but these are associations, not proven causal relationships.
The most striking figure comes from a study of nearly 2,000 men followed for more than 25 years. Those who visited the sauna 2 to 3 times per week had a 27% lower chance of respiratory conditions such as COPD and asthma. Those who went 4 or more times had a 41% lower chance. Note: this study looked only at middle-aged men.
Sauna use and regular exercise reinforce each other. People who both exercised regularly and visited the sauna 3 to 7 times per week had a 58% lower chance of dying from cardiovascular disease than people who exercised little and rarely went to the sauna. Sauna use alone (3 to 7 times per week) was associated with 26% lower cardiovascular mortality. Sauna is therefore not a substitute for exercise.
For mental well-being, a survey of 482 regular sauna users found that 5 to 15 sessions per month were associated with a slightly better mental score than fewer than 5 sessions. This involved self-reported data, not a clinical study, so the outcome is indicative. For physical well-being there was no difference.
One randomised study (38 participants, 8 weeks) examined whether sauna after exercise improves recovery. Measurement via heart rate variability showed no additional benefit over exercise without sauna. This puts into perspective the popular claim that sauna measurably speeds up post-exercise recovery.
Safety deserves attention. Fatal incidents in the sauna are rare but occur more often in people who have been drinking alcohol, who sauna alone, or who have a serious heart condition. If you have a heart disease or another serious condition, discuss it with your doctor first.
All claims are based on observational or prospective cohort studies (in part involving men only), supplemented by one small RCT. There is no proof of causality for the long-term effects. The studies come largely from Finland, which limits their generalisability to other populations.
Does regular sauna use help you live longer?
Regular sauna bathing is associated with a lower risk of premature death and cardiovascular disease in large observational studies, but a proven causal link is absent. For healthy adults it is a safe addition to an active lifestyle, not a replacement for one.
How many cups of green tea do you need per day?
Two to three cups of tea per day shows the most favourable association with cardiovascular health across several large analyses; drinking more adds little benefit, but do let your tea cool down before drinking.
How bad is eating a lot of salt for me?
Eating a lot of salt is clearly harmful to your blood pressure and your heart, and the risk grows with the amount consumed. Eating more vegetables and fruit helps to temper the effect, but does not replace reducing salt intake.
Does taking omega-3 help you stay healthy for longer?
Omega-3 reliably lowers your blood fats, but has not yet been proven to make you live longer or healthier. If you already have heart disease, discuss with your doctor whether omega-3 is a worthwhile addition to your treatment.
Is loud snoring dangerous for my health?
Loud snoring is associated with serious health risks: arterial calcification, higher mortality after a heart attack and dangerous daytime sleepiness. If you snore loudly on a regular basis and feel tired during the day, have it checked by your general practitioner.
Does gratitude or optimism benefit your health and longevity?
Greater optimism is associated in several large, long-running studies with a substantially lower risk of cardiovascular mortality and a greater chance of healthy ageing. These are associations, not proven cause and effect, but the pattern is remarkably consistent and its magnitude is large enough to take seriously.