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Morning Cold Exposure: What Cold Showers and Ice Baths Really Do | Biohack

2 Doctors on Longevity & Biohacking

11 Min.Episode 22
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Summary

The episode at a glance

This summary was generated automatically by AI from the episode transcript and translated into English. It may contain errors or omissions and does not replace medical advice.

In this episode, Mario and Max explain the effects of morning cold exposure, such as cold showers or ice baths. They explain that cold primarily promotes alertness and may improve stress resilience throughout the day. Contrary to popular belief, however, its effects on fat burning and weight loss are negligible.

Key Takeaways

  • 01Morning cold exposure increases alertness and promotes stress resilience throughout the day.
  • 02The hoped-for fat-burning effect from activating brown adipose tissue is minimal in adults and is not an effective way to lose weight.
  • 03Ice bathing (a cold plunge) in an ice bath barrel or a cold lake is the best-studied and most effective method of cold exposure.
  • 04When immersing yourself in cold water, proper breathing technique, such as box breathing, is crucial for calming your body and avoiding hyperventilation.
  • 05Beginners can start with 30–60 seconds of cold showering and gradually increase the duration to get their bodies used to the cold.
  • 06One study found that regular cold showers led to 29% less sickness absence.
  • 07Cryotherapy chambers are a drier and often more comfortable alternative to ice baths, but they are more expensive and less thoroughly researched.

In detail

Mario and Max discuss the effects of cold exposure in the morning. It primarily promotes alertness and may improve stress resilience throughout the day. However, one frequently cited effect—fat burning—is debunked as a myth. Brown adipose tissue, which is activated by cold, is present only in small amounts in adults, so the resulting calorie expenditure and potential weight loss are negligible.

There are various ways to expose yourself to cold. The simplest is a cold shower. Ice bathing (a cold plunge) in a barrel or lake is more effective but also more intense, as the body is completely surrounded by water. Another, more expensive and less studied alternative is a cryotherapy chamber, whose dry cold is often perceived as more comfortable than immersion in cold water.

Proper breathing technique is crucial during cold exposure, especially ice bathing. Initial gasping can be controlled through deliberate, calm breathing (e.g., box breathing). This helps calm the autonomic nervous system and signals to the body that there is no danger. For safety reasons, particularly because of the risk of hyperventilation, you should never go ice bathing in a lake alone.

A meta-analysis found that cold exposure increased stress resilience, with the effect emerging a few hours after exposure. Another study showed that regular cold showers can reduce sickness absence by 29%. Max takes a cold shower for 30–60 seconds every day and occasionally combines ice baths with sauna sessions. Mario, on the other hand, prefers the dry cold of a cryotherapy chamber.

What you can actually do

  • Start with 30 to 60 seconds of cold water after your usual warm shower to gradually get used to the cold.
  • Focus on calm, controlled breathing (e.g., box breathing) during cold exposure to avoid triggering your body's flight response.
  • If you try ice bathing in a lake or stream, never do it alone, so help is available in an emergency.
  • Find the method that works best for you and your daily routine; it doesn't have to be the most extreme option to have a positive effect.

Mentioned in this episode

Brown adipose tissue
A specialized type of fat tissue that can be activated by cold to produce heat. However, adults have very small amounts of it, so its effect on fat burning is minimal.
Box Breathing
A breathing technique in which you inhale for four seconds, hold your breath for four seconds, exhale for four seconds, and hold your breath again for four seconds. It helps calm the nervous system.
Cryotherapy chamber
A chamber filled with dry, extremely cold air (as low as -110°C) that serves as an alternative to immersion in an ice bath. It is often perceived as more comfortable, but is more expensive and less thoroughly studied.
Cold Plunge
Full-body immersion in cold water, such as in an ice bath barrel or a cold lake. Considered the most effective but also the most intense method of cold exposure.
Parasympathetic nervous system
The part of the autonomic nervous system responsible for relaxation and recovery. Calm breathing during cold exposure can activate this part of the nervous system.
Norepinephrine
A chemical messenger released in response to stress and cold that contributes to the increase in alertness.

What this episode is about

Cold showers in the morning for better focus and fat burning? Mario and Max debunk myths about brown adipose tissue, explain how cold actually affects the nervous system, show how box breathing helps during ice baths, and explain why people who take cold showers get sick less often.

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