None whatsoever (provided that you have a normal, balanced diet otherwise)..
Here in Canada most table salt has iodine added to it, which is a necessary element. And most foods we eat in Canada do not have natural iodine.
Despite all the warnings about salt, salt isn’t all bad. “Some sodium is necessary for human survival,” Batayneh says. “In small amounts, sodium helps maintain the correct balance of fluids in your body, and it’s also a key player in muscle contraction and relaxation.” Sodium also makes the process of sweating possible, allowing you to cool down and avoid dehydration and heat stroke, too. “Consuming too little salt can lead to muscle spasms, irregular heart rhythms, and feelings of weakness,” she adds. So the secret of eating salt for health? In a word, moderation.
www.everydayhealth.com/diet-and-nutrition-pictures/need-to-k