Fresh veggies and a healthy lifestyle are striking a blow against "genetic destiny." When a handful of patients with early-stage prostate cancer made dramatic changes to their lifestyles, switching broccoli for red meat and exercising diligently, they made equally dramatic changes to the behavior of their genes. In a new study, researchers took biopsies before and after the three-month experiment in healthy living, and found that the patients' lifestyle changes had switched on or off over 500 genes.