Eating broccoli appears to make DNA more resistant to damage.
Also note that the sources for this video are all open access, so you can click on them in the Sources Cited section, above, and read them full-text for free.
For further context, also see my associated blog posts: Breast Cancer Stem Cells vs. Broccoli; Kiwi Fruit for Irritable Bowel Syndrome; Is Caffeinated Tea Really Dehydrating?; Prevent Breast Cancer by Any Greens Necessary; and Foods That May Block Cancer Formation.