September 04, 2008
Thinking Hard Causes Overeating?

Thinking makes you hungry. So if you want to lose weight become vacuous and shallow? "Sorry I was so inconsiderate and thoughtless dear. You know my diet requires it."

Quebec City, September 4, 2008—A Université Laval research team has demonstrated that intellectual work induces a substantial increase in calorie intake. The details of this discovery, which could go some way to explaining the current obesity epidemic, are published in the most recent issue of Psychosomatic Medicine.

The research team, supervised by Dr. Angelo Tremblay, measured the spontaneous food intake of 14 students after each of three tasks: relaxing in a sitting position, reading and summarizing a text, and completing a series of memory, attention, and vigilance tests on the computer. After 45 minutes at each activity, participants were invited to eat as much as they wanted from a buffet.

The researchers had already shown that each session of intellectual work requires only three calories more than the rest period. However, despite the low energy cost of mental work, the students spontaneously consumed 203 more calories after summarizing a text and 253 more calories after the computer tests. This represents a 23.6% and 29.4 % increase, respectively, compared with the rest period.

Blood samples taken before, during, and after each session revealed that intellectual work causes much bigger fluctuations in glucose and insulin levels than rest periods. "These fluctuations may be caused by the stress of intellectual work, or also reflect a biological adaptation during glucose combustion," hypothesized Jean-Philippe Chaput, the study's main author. The body could be reacting to these fluctuations by spurring food intake in order to restore its glucose balance, the only fuel used by the brain.

"Caloric overcompensation following intellectual work, combined with the fact that we are less physically active when doing intellectual tasks, could contribute to the obesity epidemic currently observed in industrialized countries," said Mr. Chaput. "This is a factor that should not be ignored, considering that more and more people hold jobs of an intellectual nature," the researcher concluded.

Maybe the mental work uses up glucose in the brain and causes the brain cells that control appetite to sense this and drive up appetite to compensate?

Share |      Randall Parker, 2008 September 04 10:41 PM  Brain Appetite

Matt Metcalf said at September 5, 2008 9:35 AM:

I guess that explains why so many people in Hollywood are so skinny.

Bob Badour said at September 9, 2008 4:44 PM:

Actually, what is explains is why the commentary tracks on DVDs by fat directors are so much more interesting than the commentary tracks by skinny actors.

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