I have never managed to get as far as lunchtime when I've got a packed lunch. By 10, I'm trying not to think about it, and by 11.30, at the very latest, I've given in to temptation and eaten the whole thing.
I used to be a bit ashamed about my lack of discipline on this front - oh all right, my greed - until I mentioned it to my favourite colleague. He, it turns out, usually polishes off his sandwiches on the bus on the way to work - and on a couple of occasions he's actually scoffed the lot before he's even left the house.
I've felt much better since he told me that. It's one of the reasons he's my favourite colleague.