Mostly false
„Ice baths are a serious fat-burner and life-extender.”
Cold water activates brown fat, but the daily calorie effect is trivial (tens to a hundred kcal), and winter swimmers' weight didn't differ (Søberg 2021). It does lift mood and alertness instantly. After strength training it blunts hypertrophy. No lifespan data.
Sources
Last reviewed: 6 September 2026
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