Where have they gone?

When I was sick last week I lost 4lb in 24 hours, and it showed - my tummy got quite flat, my neck and cheeks were a bit more sculpted and my fingers looked positively bony.

I've now gained back 3 of those 4lb, as I expected I would, but I can't for the life of me work out where I've put them. My fingers are still bony, my tummy and neck are still slimmed. My cheeks have lost the slight hollow they developed, but I can't imagine the whole 3lb has gone into them. A mystery!