The Super-Veggies: Cruciferous Vegetables: "In a study funded by the National Cancer Institute, 20 participants were
encouraged to eat 1 to 2 cups of cruciferous vegetables a day. After three weeks, the amount of oxidative stress in their body was measured. Then, after a
three-week wash-out period, the study participants were told to take a multivitamin with fiber. Again, the oxidative stress was measured three weeks later.
And the results? Oxidative stress in the subjects' bodies dropped 22% during the period when they were eating lots of cruciferous vegetables. But the change during the multivitamin segment was negligible (0.2%),"