"Please eat something. You're going to start looking like Ears soon." The unspoken part of that was, of course, all gaunt and awful. If he'd stopped to think about Time Lords and regeneration, he might not have said something like that, but that clearly wasn't what he meant by the statement.

Jack watched the Doctor pour himself a cup of tea - which was normal to the point of shocking, compared to the pacing and mumbling and gibberish - and opened the container to offer him some of the chips. "Do you...want to talk, Doctor? It's been days. A whole week, I think." Jack kept losing track of time, but that was just him being human and inside the TARDIS for a whole long stretch of time without going anywhere or doing anything but trying to look after the Doctor. Plus not sleeping, it did a number on his internal chronometer.