Knightly: I'd rather be a Ditto than a pipe

Apparently, Kiera Knightley really, really wants to have a body like Beth Ditto's, but it's just medically not possible. She even asked a doctor how she could go about remaking herself as a ditto of Ditto:

'I went to the doctor to be checked out and asked him what I could do to put on weight. He told me that for someone of my body type to get to a size 12, I would have to eat a lot of shit food, stop exercising and drink loads.

'Basically, my body type is naturally thin. There is nothing I can do about it.'

Which is odd, because we can't quite believe (a) that anybody is naturally that thin, or that (b) anyone would have to ask a doctor how to get fat - what Kiera seems to be saying is that she's surprised that medical opinion is that to have a body with three dimensions, you have to eat food. What did she ask, exactly? "Is there a reverse on the liposuction machine?"