Even very weak fields have an effect. Some researchers believe that the suppression of melatonin is the most important link between EMF and cancer. Diet plays a role too. So far, little research has been done. Sugar probably has a similar effect.
Many drugs inhibit melatonin production.
They include prescription drugs and common drugs like aspirin and tranquilisers. Melatonin researcher Russel J Reiter believes his natural melatonin was depleted by years of taking beta-blocker drugs for hypertension. Finally, there is medical evidence that mind-body practices help. One study found that women who meditate regularly have higher melatonin levels that women who don't meditate. The current melatonin mania will, no doubt, spur more research into ways of boosting the body's melationin production naturally.