Here is my take on sea salt vs table salt: table salt is created using additives and extremely high temperatures. The additives make the salt later longer, not clump together, stuff like that. Sea salt is always (almost) pure and unrefined which is why it's better. I think they say most of the additives in table salt cannot properly be absorbed into the bloodstream and therefore builds up in your arteries. I'd think the most important thing when buying salt is to look for 'unrefined'.
__________________
|