I was under the impression that, for awhile at least, Andrea Karolyi was in charge of the food and is a nutritionist. For the life of me I can't remember where I read that though and I'm not sure if it applies any longer.
ETA found this: http://www.bayloralumniassociation.com/baylor_line/past_issues/spr08top_chef.asp
ETA found this: http://www.bayloralumniassociation.com/baylor_line/past_issues/spr08top_chef.asp