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Volume flow in the common carotid artery does not decrease postprandially.

Bernhard Martin Eicke¹, Elisabeth Seidel, Frank Krummenauer

¹Department of Neurology, Johannes Gutenberg-University/University of Mainz, Langenbeckstrasse 1, D-55101 Mainz, Germany. eicke@neurologie.klinik.unimainz.de

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging

|October 23, 2003

Summary

Postprandial fatigue is not caused by reduced brain blood flow after eating. Studies show common carotid artery flow volume significantly increases after a high-energy meal, debunking this common explanation.

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Area of Science:

Physiology
Cardiovascular Research
Neuroscience

Background:

Postprandial fatigue is commonly attributed to blood flow redistribution from the brain to the digestive system.
This widely accepted explanation lacks scientific validation.

Purpose of the Study:

To investigate the impact of a high-energy meal on cerebral blood flow.
To scientifically test the hypothesis of postprandial brain hypoperfusion.

Main Methods:

Utilized color M-mode duplex sonography to measure flow volume in the common carotid artery (CCA) in 20 healthy volunteers.
Measurements were taken before and after a high-energy meal.
Also monitored heart rate, blood pressure, and expiratory CO2.

Main Results:

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A significant increase in CCA flow volume was observed postprandially (P = .001).
Heart rate also increased significantly, but showed no substantial correlation with flow volume changes.
No correlation was found between flow volume and other tested parameters like blood pressure or CO2.

Conclusions:

The study concludes that global brain hypoperfusion does not occur after a meal.
Therefore, reduced cerebral blood flow cannot explain postprandial fatigue.