Does Sauna actually make a difference, or is it overhyped?

A well-known Finnish cohort study (KIHD) found frequent sauna bathing (4-7 times per week) was associated with substantially lower fatal cardiovascular and all-cause mortality compared with once weekly, a finding extended by related analyses from the same cohort linking sauna use, cardiorespiratory fitness, and reduced risk of sudden cardiac death. Weighing the data: Sauna looks well-supported and consequential — the evidence is rated strong (71/100) and its estimated impact on longevity is also rated highly (63/100), making it one of the more solidly-backed choices on Vitaebase.