In addition to the other things noted, historically brass has been made with a small amount of lead to help with casting. The amount isn’t enough to worry about transferring in significant amounts via touch, but it seems like it would be unwise to use it for a lot of direct food contact.
All that said, it is possible to make brass without lead, in the US we have basically mandated that for plumbing fixtures that carry drinking water. So if there were other compelling reasons to use brass we probably could safely.
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