Six million people in Cambodia suffer from iron deficiency.
Some Canadians suggested that people throw scrap iron into their cooking pots, to leech iron into their food.
People said, "Eeeew, I'm not throwing dirty metal scraps into my dinner and scratching up my cookware!"
"What if we use a smooth, easily-cleaned piece of metal, with a carefully-calculated size and surface area? And make it look like a cute fish?"
So now they are selling Lucky Iron Fish, and people aren't suffering from anemia any more.
<iframe width="960" height="570" src="https://www.youtube.com/embed/iY0D-PIcgB4" frameborder="0" allowfullscreen></iframe>
I wonder what other nutrients you could add to the fish. Potassium iodate and Vitamin A decompose below the melting point of iron. Maybe you could alloy it with zinc, and help meet people's dietary requirement for that too? Or molybdenum or selenium, in areas where the soil is deficient in those? Not sure if the cooking process would make them bioavailable in the same way iron is, however.