Saw this earlier on the BBC news home page but it is now at:
http://news.bbc.co.uk/2/hi/science/nature/default.stm
Since it will be gone soon I will copy the lead-in (such as it is):
FEATURES, VIEWS, ANALYSIS
Tour de Force
Elite cyclists have exceptional physiques -
and maybe a paunch
Actual article at:
http://news.bbc.co.uk/2/hi/health/6273202.stm