I can't believe you punish yourselves for eating. Today, my lunch consisted of a chocolate bar and a packet of crisps, my dinner was (home made) pizza and some asparagus cooked in olive oil and salt. Last night, I was hungry at 'bout 11 so went and bought myself some chips from round the corner. Admittedly I went rock climbing this evening, but only for an hour and a half, which isn't very long considering it costs me a fiver. Anyway, my point is the odd packet of crisps won't kill you, and as long as your exercising you can eat pretty much whatever you want without becoming fat.