Leach what, though? If it leaches iron, it might be more of a benefit than a problem, or at least neutral. (You can overdose on iron, but it's uncommon.)
I spent the last 30 minutes consulting the literature, I can't find any studies that indicating stainless steel leaches manganese. I realize it was mentioned in that atlantic article but they didn't cite any sources. Do you have a source indicating SS leaches Mn?
