In the morning I have a bowl of alpen with added raisens, which will usually keep me filled up so well that I often skip lunch - it's so filling it's like breakfast and lunch combined, but also pretty darn healthy.
Whilst revising I have a glass of fruit juice/water on hand and a huge bunch of grapes which I snack on almost continuously.
So, alpen for breakfast, snack on fruit continuously and then have a decent sized tea. Hey presto - you'll have a body like Kate Moss... maybe, lol!