I really never put much thought into it. When I fast I skip breakfast, if I am hungry I eat lunch, if not I skip lunch. If I want a big dinner I eat it, but if I am still not hungry I'll either eat something small or skip dinner and keep going. My best advice to to plan your fast on a day when you know you will be busy. The more I have to accomplish the longer my fast and the less I think about eating. If I plan a fast on a lazy Saturday I'll eat before 10:00am.
Strive for healthy today.
Satisfaction is the death of desire.