I should know this but I don’t. Do you credit every grant you currently have on every paper you publish? Some people seem to. Or are you more selective about the match of papers to aims of the grant?

You should technically only credit the grant that actually supported the specific study in question. At least in my experience, citing multiple grants for one study is frowned upon and could cause trouble (e.g., the NIH wondering about “overlap”).

I recall seeing recently that NIH was really going to crack down on this too, because they want to make sure only work that supports the grant aims credits the grant.

I also wonder about this occasionally but in the end I only credit the grant that was associated with getting and/or analyzing the data in the paper.