Eat the Rainbow Many studies have demonstrated the cancer-fighting effects of plant chemicals called phytochemicals. Fruits and vegetables that contain phytochemicals can often be identified by colors. Eat dark greens, red fruit, and berries. Dark Greens Dark green (broccoli, spinach, kale, collard greens, mustard greens). These vegetables contain chemicals called isothiocyanates, which have been associated with a lower risk for cancer in general. Red Fruits Red... Read More