Drs. Stark and Madar are with The Hebrew Uni- versity of Jerusalem, Faculty of Agricultural, Food and Environmental Quality Sciences, P.O. Box 12, Reho- vot 76100, Israel. Aliza H. Stark, Ph.D., R.D., and Professor Zecharia Madar, Ph.D. June 2002: 170 –176 © 2002 International Life Sciences Institute