Prevention
Studies that look at big groups of people suggest that those who eat 4 or more daily servings of fruits and vegetables rich in beta-carotene may reduce their risk of developing heart disease or cancer. Foods rich in beta-carotene include those that are orange or yellow, such as peppers, squashes, and carrots.
However, a few studies have found that people who take beta-carotene supplements may have a higher risk for conditions such as cancer and heart disease. Researchers think that may be because the total of all the nutrients you eat in a healthy, balanced diet gives more protection than just beta-carotene supplements alone.
There is also some evidence that when smokers and people who are exposed to asbestos take beta-carotene supplements, their risk of lung cancer goes up. For now, smokers should not take beta-carotene supplements.