Is rock salt healthier than refined iodised salt?

Answer

According to the Ministry, rock salt has no scientifically proven advantage over refined iodised salt; the main component of both is the same, sodium chloride. The real difference is iodine content: iodine is a mineral required for the production of thyroid hormones, and a deficiency can lead to significant health problems. Because rock salt generally contains no iodine, consuming it alone over a long period may increase the risk of iodine deficiency. What matters is not the origin of the salt but choosing iodised salt and keeping total salt intake limited.