I have noticed that some fruits and veggies, like cucumber (http://caloriecount.about.com/calories-cucumber-i11205?size_grams=52.0) have extremely low calories. 25 grams of it have only 4 calories! I think it will greatly help with my hunger issues.
Yes. It's not about calories for why we don't particularly like Fruit: it's the fructose. Why are you always hungry too? If you are fastIng you should end it with satiating foods like protein and fat not carbs or empty foods like cucumbers.
The problem is that 4 calories worth of cucumber won't satisfy you for very long. Cucumber is mostly water, some nutrients, and a little bit of fiber. I don't know about you but my body isn't tricked for very long into feeling full when I eat high-fiber low-calorie foods.
I've never understood the reason why some folks feel the need to physically have a full feeling. I much prefer eating food that provides satiety without bulk. It sounds like you want to "fast" except with a full stomach. scratches head
If you are just eating cucumbers it won't really have much of an impact on the "fasted" state. I just wouldn't go over 25, maybe 50 calories, and I wouldn't eat fat, as fat will suppress GH during a fast.
It it best not to focus on food during a fast though, and let your body adapt to running without food at certain times during the day.