It's notoriously difficult to create controlled scientific experiments on the effects of running. But this one reproduces the situation of the average adult road racer rather well:
First you find some "adult male rats with an inbred taste for alcohol". You train half of them very hard for 3 weeks. Then you take them all out to a bar.
“We had anticipated that exercise would reduce” the rats’ drive to drink, said J. Leigh Leasure, an associate professor in the department of psychology at the University of Houston and senior author of the study. Instead, the exercising animals turned to alcohol with significantly more enthusiasm than the sedentary rats, mainly during the first week of the experiment.
“It was a bit of surprise,” Dr. Leasure said.
Dr. Leasure. Heh heh.
I just signed up for this year's Prospect Park Cherry Tree 10-Miler. Better start my training tonight. After 5:00 of course.