system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Classify below into more useful and less useful minerals in our food: iron, calcium, magnesium, chloride, selenium, potassium, phosphorous,  zinc, iodine, mercury, copper.


assistant
In the given minerals, these are the minerals more useful to have in our foods: magnesium, sodium, calcium, phosphorous, chloride and potassium.
In the given minerals, these are the minerals less useful to have in our foods: iron, iodine, zinc, selenium, copper and mercury