In an article in today's New York Times:
<http://www.nytimes.com/2003/12/12/science/12GENO.html?th>

Comparing Genomes Shows Split Between Chimps and People
By NICHOLAS WADE

Published: December 12, 2003

".....
Genes involved in recycling amino acids, the building blocks of
proteins, have changed in the human line, the Science article reports.
Those could reflect changes in diet when humanlike descendants of the
mostly fruit-eating ancestor switched to meat."

-Jim