Is broccoli the healthiest vegetable First of all, broccoli is rich in antioxidants, which can protect the brain. With age, free radicals will attack brain cells along with the blood system. If antioxidants are not added to contain them, it will lead to gradual memory loss in the brain. Second, broccoli is also rich in dietary fiber, which regulates brain energy supply. Dietary fiber helps to continuously regulate the brain's energy supply.