Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
195 Doctors are Online

Why do we feel more sleepy and tired during fasting?

User rating for this question
Very Good
Answered by

Internal Medicine Specialist
Practicing since : 2001
Answered : 2272 Questions
Why do we feel more sleepy and tiedness during fasting?
Posted Thu, 4 Oct 2012 in General Health
Answered by Dr. Ram Choudhary 1 hour later
Thanks for posting your query.
Fasting is a time when we do not take the food even when we are hungry.
What we eat gets absorbed and ultimately reaches the cells where it is used in the energy generation chain called the Respiratory chain, an enzyme system that generates power for body systems.
All the living system need energy for smooth operation and food acts to supply fuel for this process.
We feel tired because we do not have enough energy for the muscles to contract smoothly for an activity.
Likewise our brain also runs on this fuel and it's supply is limited so body system uses it judiciously and we feel sleepy.
There are organs in our body whose activity is mandatory for survival like heart, liver, kidneys, brain. So in fasting state body system declares an emergency situation to save energy for these processes and makes the organism tired and sleepy so that energy is not wasted on the leasure activities. S o that is the teleological reason for this.
Hope I have answered your query.
If you have any questions I will be happy to answer.
Please close the query if you have no other questions.
Wish you a good health.
Above answer was peer-reviewed by
Share on Facebook
Share on Twitter
Share on Google+

The user accepted the expert's answer

Ask a Doctor Now

© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor