Proof Engine Verification: Cold plunges and ice baths significantly boost metabolism via brown fat activation and aid long-term fat loss.

Verdict: PARTIALLY VERIFIED - **SC1 (BAT activation): CONFIRMED** — 3 independent peer-reviewed sources (J Clin Invest 2012, J Clin Invest 2013, Int J Mol Sci 2023) confirm cold exposure activates brown adipose tissue (BAT) in humans, meeting the threshold of 2 verified sources. - **SC2 (metabolic boost): CONFIRMED** — 3 independent peer-reviewed sources (Redox Biol 2017, Endocrine Rev 2020, Front Endocrinol 2018) confirm BAT activation increases resting metabolic rate and energy expenditure, meeting the threshold of 2 ver