Regularly expose yourself to cold (1 to 5 minutes) to stimulate concentration, resilience, and metabolism, while avoiding active warming after the session to maximize natural calorie expenditure.

noli's read

The increase in concentration is explained by a significant release of norepinephrine and dopamine; a human physiology study by Šrámek et al. (2000) measured a 250% increase in peripheral dopamine, although specialists point out that this does not automatically translate to an increase in active dopamine in the brain. Regarding resilience, the exposure acts as a controlled acute stress (hormesis), supported by observational data on mood regulation. Concerning metabolism, the key observational study by Søberg et al. (2021) confirms that warming up naturally (shivering) actively engages brown adipose tissue and thermogenesis. However, the idea that this mechanism burns enough calories to significantly impact weight is largely exaggerated. Scientific literature reviews conclude that cold exposure does not lead to consistent or major body fat loss in humans.

the sources

1. 1NIH Office of Dietary Supplements 2026
2. 2Manson JE et al. 2019
3. 3Bhatt DL et al. 2019
4. 4Khan SU, Lone AN, Khan MS, et al. 2021
5. 5Liao Y, Xie B, Zhang H, et al. 2019
6. 6hubermanprotocols.com (fan reference guide)