Turns Out, Brown Fat Has Been Keeping a Secret
By Mark J Kaylor
Turns out the fat you actually want more of has been holding out on us. Scientists long believed brown adipose tissue (BAT) generated heat through a single protein, UCP1 — case closed, mystery solved. Then NIH-funded researchers at Washington University published a study in Nature (September 2025) revealing that BAT runs an entire second heat-production system, tucked inside organelles called peroxisomes and powered by a gene called ACOX2.
Cold exposure specifically wakes this backup pathway up. So when you brave that cold shower or step out into a crisp morning, your brown fat isn’t just doing one job — it’s running parallel operations we’re only beginning to map. The upside: those small, voluntary cold exposures you’ve been half-heartedly attempting may be doing considerably more for your metabolism than anyone knew.
Mark J. Kaylor is a passionate advocate for holistic health and natural remedies, with a focus on extending both lifespan and healthspan. As the founder of the Radiant Health Project and host of Radiant Health Podcast, Mark blends in-depth research with traditional wisdom to empower others on their journey to vibrant health. Through his writing and speaking, he shares insights into the transformative power of herbs, nutrition, and lifestyle practices.
The Radiant Health Project is a not-for-profit initiative dedicated to cutting through wellness industry hype and sharing evidence-informed, traditional wisdom for genuine health.
Disclaimer: All information and results stated here is for educational and entertainment purposes only. The information mentioned here is not specific medical advice for any individual and is not intended to be used for self-diagnosis or treatment. This content should not substitute medical advice from a health professional. Always consult your health practitioner regarding any health or medical conditions.