Does Cold Plunge Increase Metabolism? What the Science Says

Feeling constantly fatigued, chilly, or struggling with stubborn weight despite eating well? 

These frustrating symptoms may point to a slow metabolism, a hidden culprit that affects energy, digestion, and even hormones. 

Ignoring it can leave you stuck in a cycle of low energy and weight struggles. But emerging science suggests that cold plunges might just kickstart your metabolism, here’s what you need to know.

• Cold Plunges Give a Short-Term Boost: A few minutes in cold water can raise your metabolism slightly.
  
  

• Activate Brown Fat: Cold exposure triggers brown fat to burn energy and produce heat.
  
  

• Shivering and Non-Shivering Work Together: Both help you generate warmth and increase calorie burn.
  
  

• Hormones Amplify Energy Use: Adrenaline and norepinephrine kick your metabolism into action.
  
  

• Complement, Don’t Replace: Use cold plunges alongside exercise and healthy eating for best results.

Research suggests that cold plunging can temporarily increase your metabolism, but the effects are more modest than many people expect. 

A review published in the Frontiers in Physiology journal found that short-term cold exposure (around 16–19°C) significantly increased daily energy expenditure by about 188 calories, while also boosting the volume and activity of brown adipose tissue (BAT), the “good” fat that burns energy to produce heat. 

Similarly, findings in the PLOS One journal show that cold exposure activates brown fat and can sharply raise metabolic rate during the cold challenge. 

However, the body often compensates by increasing hunger and food intake, which may limit weight-loss effects. 

In practical terms, a 3–10 minute cold plunge may burn an extra 50–150 calories, offering a short-term metabolic boost. 

While this can support overall calorie expenditure, cold plunging works best as a complement to exercise and healthy nutrition, not a standalone fat-loss solution.

When your body is exposed to mild cold, it doesn’t just make you shiver, it switches on brown fat, a special type of fat that burns energy to produce heat. 

Research published in The Journal of Clinical Endocrinology and Metabolism found that simply lowering room temperature from 24°C to 19°C increased overall energy expenditure by about 5%, thanks to cold-induced thermogenesis (CIT). 

The study also showed a measurable rise in brown fat activity, confirming that even small drops in temperature can nudge your metabolism upward. 

Scientists have also observed that people who regularly expose themselves to cold, such as winter swimmers or those who keep their homes cooler, develop significantly more active brown fat. 

In fact, cold-acclimated individuals have shown up to a 42% increase in brown fat volume and around a 10% boost in metabolic activity, along with better blood sugar control and delayed shivering. 

Over time, consistent cold exposure can essentially “train” your metabolism to burn more energy naturally.

When your body is exposed to cold, it has two main ways to generate heat: shivering and non-shivering thermogenesis. 

Shivering is the body’s immediate response, rapidly increasing metabolism by burning both carbohydrates and fat, though carbohydrates see the largest relative boost. 

While effective, relying on shivering isn’t ideal long-term, since carbohydrate stores are limited compared to the abundant fat reserves. 

Non-shivering thermogenesis, on the other hand, is driven by brown adipose tissue (BAT), which acts like the body’s natural furnace. 

BAT is activated by the sympathetic nervous system and uses a special protein called UCP1 in its mitochondria to convert fat and glucose directly into heat. 

This process burns calories without muscle contraction, even before shivering begins. With regular cold exposure, BAT activity can increase, and some white fat can transform into brown-like fat, further boosting energy expenditure. 

Together, shivering and BAT activation help maintain body temperature while subtly enhancing metabolism and calorie burn in cold environments.

When you step into the cold, your body quickly releases hormones like adrenaline and norepinephrine to keep you warm. 

These hormones raise your heart rate and push your metabolism to work harder. As a result, your body starts burning more calories to create heat. 

At the same time, brown fat switches on and uses stored energy to warm you up, which boosts energy use even more. 

This reaction starts within minutes, showing how fast your body adapts. Over time, regular cold exposure can train your system to become more efficient, helping you improve metabolic health while naturally increasing daily energy burn.