UC Berkeley  PR office announcement:

http://www.berkeley.edu/news/media/releases/2004/06/01_usdiet.shtml

Abstract of published scientific article on ScienceDirect (Elsevier)
website:

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WJH-4CG7FR0-J&_coverDate=08%2F31%2F2004&_alid=177299208&_rdoc=1&_fmt=&_orig=search&_qd=1&_cdi=6879&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=53af508cac23f727041c9eab130a4ad0

Tom Billings