I had just been reading an extremely boring article, where some clueless "experts" tried to explain what humour is, when I had a look in here and saw your comment.
I laughed for half an hour.
That is humour!
I am hoping that lianne852 is soon returning with the rest of the question.
I think that's a bit unfair to Ally and Lianne. Lianne asked a simple question out of curiosity, I'm sure Ally has a sense of humour but here may have just been wanting to provide any response out of courtesy because nobody else had replied.
I don't know either, I imagine someone such as Steve Redgrave might have had use for one when in full training (T2 but on 6000 calories a day or somesuch). But I'll bump this again in case someone has a better answer.
I apologize in case I misunderstood something, but I don't see any question to bump, only half a sentence.
My English skills may not be good enough though.