After 30 days on iodine, people started showing aluminum in their urine. Aluminum is "basically" the cause of Alzheimers. Nobody want Alzheimers, but older folks are especially worried/concerned.
Also, CANCER! Iodine IS the "anti-cancer"...and that's another thing folks are extremely worried about.
I'm almost positive that both Aluminum and Cancer are addressed on that particular audio...I don't think the alzheimers/aluminum link is made, but I think the aluminum is mentioned.