Eighteen volunteers received 500 g fresh broccoli every day for 12 day
s after a 6-day period of standard diet. The activity of CYP1A2, CYP2E
1 and the estrone 2 and 16 alpha-hydroxylation were determined prior t
o and after the broccoli diet. The average activity of CYP1A2 and the
average 2/16 alpha-hydroxyestrone ratio were increased 19% (P < 0.0005
) and 29.5% (P < 0.05), respectively; however, no effects were observe
d on the CYP2E1 activity. (C) 1997 Elsevier Science Ireland Ltd.