Yea I know what you mean - its not always the easiest thing to do.
I think if you keep in mind why your doing a fast then it is less tempting to say - "oh heck", and eat something.
I guess its a bit like the old saying - "you can't have your cake and eat it too".
Like you can't have your fast and the little pleasures that you normally do too.
Good luck on what you decide.