New User ? Sign Up  |  Sign In  |  Help
StrangeQuestions
Get the Answers at StrangeQuestions.com!
ask
answer
explore
Search for questions :
My Profile

NotEinstein

Open Questions Bookmark and Share

Why do we feel sleepy after a big meal?


Is it true that you become more sluggish because blood is rushing to your digestive system?

3495 day(s) ago

    Comment(s) (0)
    Report Abuse
   Find Interesting  
   Email to Friends  
   Bookmark  
   Subscribe to Answer Alert  
No comments yet !!!     Be the first to comment !!!
Answers (1)

cabbagehead
No. The amount of extra blood circulation to your digestive organs isn't enough to impact the rest of your body. The sleepiness is a result of a chemical reaction in your brain that seems to be linked to both sleeping disorders and obesity.

When you eat a large meal, glucose levels in your blood increase, shutting off orexin neurons. These cells, located in the hypothalamus, release alertness chemicals called orexins. They release fewer orexins at night, making us sleepy.

It's believed this reaction is an adaptation to keep us alert when we need food and then conserve energy once we've eaten.

Malfunctioning orexin neurons can result in narcolepsy, which results in constant tiredness and often obesity. Sleep deprivation can also interrupt orexin production.

At the same time studies were being done on orexin and sleep, other studies were linking sleep deprivation to increased food intake. It's believed that the two are linked: fluctuations in blood glucose levels and sleep deprivation can disrupt regular orexin production, resulting in obesity. Tests in mice have borne this out, with orexin-deficient mice becoming obese even if their food intake is the same as regular mice. If human trials are conclusive, we may soon have orexin-based treatments for weight loss.

Posted 3495 day ago

( 0 )
( 0 )
    Comment(s) (0)
   Report Abuse
No comments yet !!! Be the first to comment on this answer !!!

Edit your answer. Click save when done.
Question Title Why do we feel sleepy after a big meal?
Your Answer
Character Count ( Max. - 5000 ) : 91
Email this question link to friends
Please enter e-mail address and name for each friend..
Friend #1 -
Friend #2 -
Friend #3 -
Friend #4 -
Friend #5 -
  Your comment on this question
Max Allowed : 5000 Characters Current Count : 0
  Your comment on this answer
Max Allowed : 5000 Characters Current Count : 0