Why not try going as long as you can without eating, then when you must eat have a salad, simple raw and cooked veggies and fruit. Eat as much as you want, but limit yourself to those choices. These foods are low calorie, nutrient dense, and when eaten without unhealthy additives like transfat dressings, sugar, and chemical additives can help detoxify your body and make fasting easier. Avoid breads, most grains, dairy, meats, and all refined or processed foods. This approach will help you gain discipline over your eating habits and also cleanse your body and prepare it for a longer fast. Consider this a one day at a time plan, don't try to do it all the first few times.