There is no such thing as the top three cancer prevention vegetables. The main role of vegetables is to provide us with some vitamins, minerals and dietary fiber. Some vegetables are high in starch, which can provide an adequate source of carbohydrates. Although a single variety of vegetable does not protect against cancer, eating vegetables does benefit your health. The Dietary Pagoda recommends that a healthy adult should eat about 250 to 400 grams of vegetables per day. The occurrence of cancer is related to a number of factors, i.e. genetic predisposition, the living environment, dietary factors and psychological factors are all related to the development of cancer. A healthy and balanced diet (including vegetable intake), a favorable environment and a positive mindset are conducive to reducing the incidence of cancer.