I regularly drink a laxative tea to cleanse my colon. Could that be harmful? —M.H., Fort Dodge, Iowa

Yes, and there’s no evidence that it has any benefits. Proponents of colon cleansing, or "detoxifying," claim that the practice removes built-up toxins, rejuvenates the digestive tract, and can even fight cancer. But there’s no credible research to back up those claims. What’s more, a healthy body doesn’t need outside help clearing out toxins, nor does your digestive tract require restorative rest. Worse, the chronic use of laxatives can be dangerous, leading to fluid loss, dehydration, and electrolyte imbalances.

To maintain colon health, eat a diet rich in fruits and vegetables and get regular exercise, which in addition to its many other benefits seems to help keep the colon working properly.