To Your Good Health: Can peanuts cause colon cancer?

DEAR DR. ROACH, I recently saw my primary doctor for a physical, and after I mentioned that I eat a fiber bar every day (that also contains peanuts and peanut butter), he informed me of a new study that says peanuts can cause colon cancer. Any truth to that? – K.T.K.

ANSWER: The literature is remarkably consistent that peanuts and tree nuts reduce risk of colon cancer and improve survival in people who have colon cancer. Unless your doctor knows of data I couldn’t find, I have to wonder if he was mistaken or didn’t communicate well.

Do beware of fiber bars that contain too much sugar.

Dr. Roach regrets that he is unable to answer individual letters, but will incorporate them in the column whenever possible. Readers may email questions to .