Health experts used to think that a diet high in fiber would help prevent colon cancer, since rates of that cancer are lower in countries where fiber consumption is high. But scientific studies aiming to prove such a link have not been able to do so. Trials that randomly assigned some people to a high-fiber diet and others to a low-fiber diet found that people in both groups developed pre-cancerous colon polyps at essentially the same rate, according to the Harvard School of Public Health.
Ricardo DeAratanha / Los Angeles Times
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