This document discusses how green leafy vegetables can decrease cancer risk. It notes that diet is linked to about one-third of cancer cases in the US. Phytochemicals in plants like greens may reduce cancer risk. Greens contain vitamins A and C, fiber, and beneficial phytochemicals, which can lower the risk of cancers like colon cancer. The document recommends including 3-4 servings of dark green leafy vegetables per week to gain these benefits.