system
Given the following post, respond as if you're commenting on Reddit:
human
eli5 Why do people iodize salt?

Was in a cafe today and saw this salt canister that said iodised salt. Why do they do that to the salt? What does it add?
gpt
Iodine, in tiny amounts is necessary for the human body.  It was found in the early 20th century that people were not getting enough in our diets.  Salt is an easy delivery mechanism because it doesn't spoil and generally speaking it's a predictable delivery method for the amount necessary.