Between September 1984 and June 1985, a total of 75 adolescent girls, 35 vegetarians residing in a Seventh-Day Adventist school and 40 nonvegetarians residing in a private non-Adventist boarding school, under went measurement of their plasma hormone levels in the follicular and luteal phases of their menstrual cycles as well as dietary intake measured by 3-day food records, medical history, hei...