• Mr Salus Sporting Lab

Do you burn fat when you sweat?



Many people have a misconception about sweating!


Many time I have seen, during the summer period, on the sunny streets of my native city of Naples, people running around wearing winter running clothes including a rain jacket!


My first question was why do they run like that?!


Later I have tried to give some explanations to myself:


1 They want to lose weight more rapidly losing more liquids.

2 they think that making more effort to run they are going to burn more calories.

3 They think that more you sweat more you lose weight and burn fat.


I had a confirmation of my thoughts when I was providing a Diet Program to a my overweight patient that asked me a question: Do I burn more fat and calories if I sweat more?


To respond to his question I have explained to him why do we sweat.


Sweating is a process of our organism to protect itself from the high temperature. Our body works perfectly at 36° C and all its physiological processes can take place normally.


When we start to exercise , the temperature of our body increases due to the heat produced by our muscles in activity. When the temperature increases above 36° C, our body operates a defense mechanism, the sweating, to decrease its temperature.


Our body produce a salty and colorless liquid which comes through its skin.


This liquid is composed by:

  1. Water ( 99% )

  2. Sodium ( 0,9 gram/Liter )

  3. Chloride

  4. Potassium ( 0,2 gram/Liter )

  5. Traces of Urea ( Waste Product ), lactic Acid, Protein, Fatty Acids.



How we can note from the graph above, the most part of our sweat is composed by water and so It is not so convenient to lose too much of this liquid for the risk of dehydration and overheating.


So It is quite dangerous try to sweat more to lose weight or burn fat as It does not produce more burning fat or real weight loss.


In fact even if after an heavy sweating our body's weight can decrease we need to drink the same amount of liquid to restate the normal hydration of our body.


During exercise the condition of dehydration and overheating of our body is very dangerous as It can lead to a syncope ( fainting ).


If you want to know how to bur fat you need to understand your Energy Metabolism because the two key points to burn fat are the Intensity and time of the workout!




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2018 Mr Salus Sporting Lab : Sports Therapy - Gait Analysis - Dietetics

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