Not necessarily licking (I mean, if you do it enough...), but this is a thing
Cool story with interesting social, cultural, and scientific interactions.
It may have been discredited outside of simple iron deficiency since I last read about it, but dietary studies on humans are notoriously difficult to do.
We used one of these with our daughter when she had a concerning iron deficiency. I'm not super sure if it helped since we also started feeding her more iron containing foods, but it didn't hurt 🤷♂️
This specific thing? Or just an iron chunk of some type?
The reason I know about this is the social aspect of trying to get people with endemic iron deficiency to use a supplement. If you're from the more industrialized would, I'd figure you'd take supplements that, while more expensive, may or may not be more effective.
A little cat iron puck was introduced in an Asian region with high iron-deficiecy in the poorer population, but nobody used it. So they did some research and changed it to resemble a fish instead and it took right off. Turns out the local culture considered fish lucky or something.
I actually teach my students about this strategy that the WHO employee in Micronesia in my sport nutrition class. It's less about the iron fish, and more about that dietary iron can come from cast iron cooking sources instead of supplementation (as the latter often causes digestive distress).
I saw someone do a demonstration once, they took a box of "iron-fortified" breakfast cereal, dumped it into a bowl, then ran a magnet through it. The magnet picked up some of the dust from the bottom of the bowl, that dust being the tiny iron particles that were added to the cereal to "fortify" it.
I put them in quotes as the word has no objective meaning as applied to a breakfast cereal, it's simply a marketing term. I did not intend to imply that ingested iron particles are not a valid source of iron for human biology.
put the ''words'' in quotes because in context it's definitely ''absurd bullshit'' and this is how i know that key on my keyboard doesn't work i have to use a different key so thanks
US RDA age 19+ is 8 mg / day. Maybe if the iron bar is really rusty. Or, pills are cents a day. OR you could eat breakfast cereal or liver, lentils or spinach, Popeye.
I've read once that eating iron won't do anything for your iron intake, but for example sticking some rusty nails through an apple for a while and then eating the apple would.
Tetanus is a bacteria that lives in soil. It's only associated with rust because rust gives more surface area to allow dirt to accumulate on which bacteria can survive, and because iron objects are often sharp enough to pierce the skin. If you were cut with a gleaming razer that had just had soil smeared on it you'd have a good chance of contracting tetanus!
It's also because the bacterium in question is anaerobic, so it dies in an oxygen environment; rusting consumes oxygen, so it helps preserve the bacterium longer out of soil.
Edit: I had always been told this, but evidently it isn't true. The rust does not seem to have any effect on the bacterium that causes tetanus. Apologies for spreading misinformation.
When my wife was pregnant, a buddy gave her an old cast iron pan and told her to heat applesauce in it. Said it should help her iron deficiency, too bad we're to add to have remembered....