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Dr Rangan ChatterjeeDr Rangan Chatterjee

What Happens After 30 Days of COLD SHOWERS? - This Will SHOCK YOU! | Dr. Susanna Søberg

Watch my first cold water immersion experience with a step-by-step guide. Cold showers, icy plunge pools, outdoor swimming – are you a fan, or does the very idea make you shiver?

Dr. Susanna SøbergguestDr. Rangan Chatterjeehost
Jan 4, 20232h 11mWatch on YouTube

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At a glance

WHAT IT’S REALLY ABOUT

Dr. Søberg Explains Brown Fat, Cold Exposure, and Minimal Effective Doses

  1. Søberg explains that cold activates brown fat, an organ that burns blood sugar and fat to produce heat, and she links lower brown fat to obesity, type 2 diabetes and cardiovascular disease.
  2. She argues that short exposures are enough, citing a trial where 30 seconds of cold at the end of a shower matched 60 or 90 seconds and was associated with fewer sick days, and her own finding that about 11 minutes per week suffices once adapted.
  3. Cold triggers rapid noradrenaline and sustained dopamine release and activates both the stress and calming branches of the nervous system, which she says builds confidence, mental balance and resilience.
  4. Both speakers warn against ego and competition, noting individual differences in tolerance, risks such as the afterdrop and hypothermia, and the need for caution with children.
  5. Søberg says her protocol also includes about 57 minutes of sauna per week, and she points to Finnish cohort data linking regular sauna use to lower mortality.

IDEAS WORTH REMEMBERING

5 ideas

Brown fat is an inner heater that cold keeps active

Søberg says cold on the skin triggers noradrenaline, which makes brown fat take up sugar and fat to generate heat. She says brown fat declines after about 40 and that using it helps keep it.

You don't need extreme cold or long durations

Søberg cites a cold-shower trial in which 30 seconds was as effective as 60 or 90, and she says water at 15°C or below counts as cold. She also says sleeping in a 19°C room for a month increased brown fat.

More is not better because of hormesis

Søberg describes a sweet spot of micro-stress that strengthens cells, while overdoing it exhausts them. She compares this to the Finnish sauna data, where benefits plateau beyond roughly 30 minutes.

Cold exposure affects mood and mental state

Søberg reports noradrenaline rising up to 250% above baseline within minutes and dopamine staying elevated for up to four hours, without the crash seen with drugs. Both speakers say the cold pulls you out of your head and builds confidence.

Competition and ego make cold exposure risky

Søberg says staying in for many minutes is about mind control rather than health benefits and carries risks such as hypothermia and the afterdrop in core temperature. Tolerance varies with body composition, work environment and nervous system sensitivity.

WORDS WORTH SAVING

5 quotes

We are in a society right now where we are overwhelmed. We are overwhelmed in a way where we can see statistics of depression, anxiety, and, uh, stress curves going right up.

— Dr. Susanna Søberg

Every time you do that you get a little bit stronger, not only in your, in your cells, but also in your mind.

— Dr. Susanna Søberg

I think it's a bit underrated, actually, the brown fat. It is mystic, but it's also underrated what it's doing for us.

— Dr. Susanna Søberg

We consume all this information and we think, "Yeah, that's great," and we drop a heart or we drop a like on Instagram, and we think that we've done something, but all we've done is actually move our thumb.

— Dr. Rangan Chatterjee

You cannot think about anything else. You are in the moment. Whether you d- you want to or not, the cold would get you there.

— Dr. Susanna Søberg

Read the available transcript
Brown fat and metabolismCold shower immune studyHormesis and micro-stressCold shock and diving responsesNoradrenaline and dopamine releaseCold exposure safety and afterdropThe Søberg Principle: 11 minutes cold, 57 minutes sauna

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SPEAKERS

  • Dr. Susanna Søberg

    guest

    Researcher and scientist known for studying deliberate cold exposure (winter swimming), brown fat, and related physiological effects.

  • Dr. Rangan Chatterjee

    host

    Medical doctor and host of the podcast "Feel Better, Live More," focused on lifestyle medicine and wellbeing.

High quality AI-generated summary created from speaker-labeled transcript.

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