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Hot and cold contrast showers: Immune system boost, sense of wellbeing, weight loss and sharper brain function. I’m in!

Updated: Jun 14


Anyone who knows me intimately knows that I fear the cold. That’s one of the reasons why I left the U.K. I was born in Kenya and moved to the U.K. at age 23. For 20 years living in the U.K., I always had my bags packed, ready to go somewhere warm. But I had to finish my medical training and raise my child, so I stuck with the cold. When I’m cold, I can’t think.


However, in 2006, I overheard a conversation about hot and cold showers. They mentioned that it boosts your immune system and makes you feel less cold afterward. I was sold! From that blessed day in 2006 until now, I haven't missed a day where I don’t finish my hot showers with cold water. I even went through a phase where I preferred morning baths, and I had a bucket of ice-cold water ready to pour on myself after the bath.


In the beginning, I occasionally forgot to finish a hot shower with cold, but in the rare instances that happened, I would get back into the shower, blast hot water, and then finish with cold. Now, I get fewer coughs and colds, and I’m leaner than I ever was.

Here's a breakdown of how contrast showers (hot and cold showers) work:


Hot Showers and Weight Loss

1. Improved Circulation: Hot showers can dilate blood vessels, improving circulation and helping deliver more oxygen and nutrients to muscles and tissues. This can aid in recovery after exercise.


2. Muscle Relaxation: The heat helps relax muscles and reduce tension, which can support better workouts and recovery.


3. Increased Metabolic Rate: The heat can raise the body’s core temperature, temporarily increasing metabolic rate. This can lead to a slight increase in calorie burning.


Cold Showers and Weight Loss

1. Brown Fat Activation: Cold exposure can activate brown adipose tissue (BAT), also known as brown fat. Unlike white fat, which stores energy, brown fat burns calories to generate heat. This process can help increase energy expenditure.


2. Increased Metabolic Rate: The body works harder to maintain its core temperature when exposed to cold, which can increase metabolic rate and calorie burning.


3. Reduced Inflammation: Cold showers can reduce inflammation and muscle soreness, potentially leading to quicker recovery and the ability to maintain a consistent exercise routine.


Contrast Showers (Alternating Hot and Cold)

1. Improved Circulation: Alternating between hot and cold water can improve blood flow as the blood vessels constrict with cold and dilate with heat. This can enhance overall circulation and recovery.


2. Enhanced Metabolic Rate: The rapid changes in temperature can stimulate the cardiovascular system and potentially increase metabolic rate, contributing to calorie burning.


3. Boosted Immune Function: Some studies suggest that contrast showers can stimulate the immune system, leading to better overall health and potentially supporting weight loss efforts by keeping you healthier and more active.


Mechanisms Behind Weight Loss

1. Thermogenesis: Both hot and cold showers can induce thermogenesis, the process of heat production in organisms. Cold-induced thermogenesis through brown fat activation is particularly notable for its calorie-burning potential.


2. Hormonal Regulation: Cold showers can increase levels of norepinephrine, a hormone that can boost metabolism and fat burning. Hot showers can reduce stress and promote relaxation, indirectly supporting weight loss by reducing stress-related eating.


3. Enhanced Recovery: By aiding muscle recovery and reducing inflammation, contrast showers can help maintain a regular exercise routine, which is crucial for weight loss.


Practical Tips

- Duration: Start with short durations (e.g., 30 seconds of cold followed by 1-2 minutes of hot) and gradually increase as you become more accustomed to the temperature changes.

- Frequency: Contrast showers can be done daily or several times a week, especially after workouts.


- Safety: Always listen to your body and avoid extremes that might cause discomfort or health issues.


While contrast showers can complement a weight loss regimen by boosting metabolism and enhancing recovery, they should be part of a broader strategy that includes a balanced diet and regular exercise for effective and sustainable weight loss.


For the Nerds amongst us!

How does brown fat burn calories?


Brown fat, or brown adipose tissue (BAT), burns calories through a process called non-shivering thermogenesis. Here's how it works:


1. High Mitochondria Content: Brown fat cells contain a high number of mitochondria, which are the energy powerhouses of the cell. These mitochondria contain a protein called uncoupling protein 1 (UCP1).


2. Activation by Cold Exposure: When you are exposed to cold, your body activates brown fat. This is a natural mechanism to maintain body temperature.


3. Thermogenesis: In the presence of UCP1, the mitochondria in brown fat cells generate heat instead of storing energy. UCP1 uncouples the normal process of ATP (energy) production in the mitochondria, causing the energy to be released as heat.


4. Burning Calories: To produce this heat, brown fat burns calories. It uses fat (lipids) and glucose from the bloodstream to generate the necessary energy. This process increases your overall energy expenditure.


5. Metabolic Benefits: Increased activity of brown fat has been associated with improved insulin sensitivity and better regulation of blood sugar levels, which can contribute to overall metabolic health.


So, there you have it!

Brown fat burns calories by converting energy into heat through a specialized mechanism involving UCP1 in the mitochondria, particularly when the body is exposed to cold. This not only helps keep you warm but also boosts your metabolic rate and helps with weight management.



Dr Purity Carr

GP & Menopause Doctor

Harvey WA 6220


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