People that live in coastal places like New Zealanders, Malaysians or Japanese often eat edible water-inhabiting plants such as seaweeds or algae. They are a real treasure for those who are conscious about healthy eating. Seaweeds contain considerable amounts of magnesium, iodine, potassium, calcium, iron and different types of vitamin B.
These days you do not have to live on the coast to have seaweeds in your everyday diet. They are always available in large supermarkets or healthy food stores either in fresh or in dried form.