These sites are full of hype and a lot of misinformation. They are generally selling some mercury binding product or have a site somewhere else selling such a product. So they want to make it sound more scary than it really is so you will buy their product. Or the sites are written by well meaning people that do all their research from these sales sites. This is why we see so many people claiming they have mercury poisoning even though their symptoms are not those of mercury poisoning. These sales sites frequently list symptoms that have nothing to do with mercury.