<p>The evidence base is more modest than the advocates suggest and more substantial than the sceptics allow. A 2022 systematic review in PLOS ONE found consistent evidence for cold water immersion reducing delayed onset muscle soreness, moderate evidence for mood improvement, and limited but promising evidence for immune function.</p><p>The mechanisms are better understood than the outcomes. Cold exposure triggers norepinephrine release (up to 300% in some studies), activates brown adipose tissue, and stimulates vagal tone — all of which have plausible pathways to the reported benefits.</p><p>What the evidence does not support is the more extravagant claims: cancer prevention, reversal of chronic disease, significant fat loss. These belong to the enthusiasm of practitioners, not the findings of researchers.</p><p>Used appropriately — as one element of a comprehensive programme, in a safe environment, with proper instruction — cold immersion is a valuable tool. Used as a magic bullet, it is a disappointment waiting to happen.</p>
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