That's a very misleading statement, the body is able to significantly reduce the amount of iron absorption through the intestines.
Non-genetic related iron overload is rarely heard of outside of dietary supplement overuse, predominantly children eating iron fortified supplements.
For an ordinary person to eat too much iron, you would have to have an exceptionally bizarre diet, especially if you're overdosing on iron via elemental iron.
The upper tolerable limit for a daily intake of iron is 45mg. To get this via sirloin steak, you would have to eat three and a half pounds a day! Or 3700 calories of steak per day.
Given that heme-iron is the most readily absorbed by the body, and that guidelines suggest vegetarians consume 1.8 times the RDI, which would suggest an 80mg upper tolerable limit for non-heme iron.
So lets take Broccoli, everyone knows that's iron rich. 2.1mg per medium stalk (1/3lb), which would amount to 7 lbs of Broccoli a day.
Food examples are great and all, but the article is about an iron block that you cook food with. Per your numbers, one would only need to consume 80mg+ per day (of the elemental) to start getting into trouble territory.
My concern is over how cooking conditions (or other factors) may affect how much iron leaches out into the food, which would cause iron overload if high enough, just like those iron fortified supplements.
I never stated that the body can't adjust the amount of iron absorbed.
I stated that iron overload, which is when one's body already has too much iron accumulated, is not well handled by the body. This is true, because the body is very poor at excreting iron in response to excessive iron levels, because iron is conserved very well (unlike, say, Vitamin C).
Non-genetic related iron overload is rarely heard of outside of dietary supplement overuse, predominantly children eating iron fortified supplements.
For an ordinary person to eat too much iron, you would have to have an exceptionally bizarre diet, especially if you're overdosing on iron via elemental iron.
The upper tolerable limit for a daily intake of iron is 45mg. To get this via sirloin steak, you would have to eat three and a half pounds a day! Or 3700 calories of steak per day.
Given that heme-iron is the most readily absorbed by the body, and that guidelines suggest vegetarians consume 1.8 times the RDI, which would suggest an 80mg upper tolerable limit for non-heme iron.
So lets take Broccoli, everyone knows that's iron rich. 2.1mg per medium stalk (1/3lb), which would amount to 7 lbs of Broccoli a day.
Please, don't state bullshit like it's a fact.