Saw Tony Adams do it yonks ago, It's a well known source of instant energy, when t'owd man wasn't so t'owd and used to train every day in the gym, after or before work he used to have a banana sandwich and half a pack of jaffa cakes prior to a 2 hour work out, worked wonders for endurance.
Yoonited players used to do it regularly under fergie. Particularly ferdinand. Your body is able to break them down easily so it's converted to energy quickly.
Ahh right surprised I've never picked up on it before then. I've only ever been given bananas and oranges when I've played.
I recall Bobby Hassell eating a pack of jaffa cakes in extra time in the play off final back in 2006.