[casualrandomcom]

Italian television brought coffee to the lab, and the results where not reassuring (from minute 18 onward, only Italian, I am sorry)

https://www.rai.it/programmi/report/inchieste/Un-espresso-a-...

aluminum was at around 1/6 of the EU recommended maximum safe concentration. But you could cut this in half using the stainless steel moka. Apparently about half of the aluminum came from the coffee powder itself and half from the moka.

A lot of metals from the coffee itself, apparently because of fertilizers and insecticides.

Anyway the moka itself released around 0.3 mg per liter of aluminum

[gattilorenz]

Worth noting that the TV show is somewhat known for unreliable/biased reporting.

The amount of aluminum released by the moka is tiny, and as the EU guidelines say ( https://health.ec.europa.eu/system/files/2018-03/scheer_o_00... ) "cooking in aluminium containers or preserving food in aluminium-containing cans or pots often results in statistically significant, but not biologically important, increases in the aluminium content of some foods". [emphasis mine]

Considering the amounts we're talking about (of aluminum released, and of coffee from a moka pot), it's fundamentally a non-problem.

[gattilorenz]

I was curious so I searched for extra context: from the same document, the mean diet-related intake quantities for aluminum in norway are 0.29 mg/kg bodyweight/week; this means that if you are 70 Kg, you would normally ingest about 20mg of aluminum a week.

Assuming you drink a whole liter of "aluminum moka coffe" a week, you get 0.81mg extra aluminum in your diet. A liter is about 16 "italian cups". You would get a heart attack before noticing symptomps of aluminum intoxications...