Does slow digestion mean slow metabolism?

Answered on August 19, 2014
Created April 19, 2013 at 3:51 PM

So, I have read a lot about fasting and how it slows your metabolism, but I enjoy doing a 24 hour fast every once and awhile to give my body a little bit of a break.

I noticed, though, that every time I fast, I have no bowel movements and I don't hear much digestion-related noises coming from my abdomen.

With this, when I go a few days without being very active (rest days) my digestion usually slows in the same way.

Are these two things connected? Or is my digestive system just seizing the opportunity to rest?

Additionally, does my slow digestion during fasts mean that I am not using my body fat for fuel as effectively?

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2 Answers

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on April 19, 2013
at 06:35 PM

Interesting question. The following study indicates that the short-term effect of starvation - 1-3 days - is increased BMR, by as much as 15%.


If your fast is longer than that, metabolism does drop off.



on April 19, 2013
at 06:21 PM

Although there are contradicting views both ways, there is no proof that fasting actually slows down metabolism.

As for relation between fasting and low activity, I don't think these are related at all. When fasting, you don't hear much digestion because you are not eating AKA your body has nothing to digest. When you rest for a few days I would assume not only your body is resting but you also are not eating as much, making it less work for your digestive tract.

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