"Supplying thyroid hormones to iodine-deprived individuals masks the Iodine deficiency and can result in a zombie-like effect. The patients are capable of performing physical work but are not able to think and reason at maximum capacity.
An even greater negative effect is realized if Iodine deprivation is combined with goitrogen saturation, using the potent goitrogens bromide, fluoride, and perchlorate in the food and water supply."
sums up what we have been talking about lately;
Rest my case :)