Fiber binds to fat-soluble toxins in the bile and ushers them out of the body through the gastrointestinal tract. But not all fiber is created equal, Crinnion says. Found in whole-grain brown rice, rice bran fiber has been shown to bind particularly well with polychlorinated biphenyls (PCBs) and other industrial toxins. Studies showed that after Japanese patients who had been poisoned by PCB-contaminated cooking oil consumed 7–10 grams of fermented rice bran fiber three times a day for a year, they excreted twice as many toxins as those who did not. Dose: Try 2 tablespoons rice bran fiber powder, or 3 capsules, with each meal.