I have been eating 3 to 4 fruit shakes a day. With my magic bullet it is quick and easy to put together a quick fruit shake.
Here is a picture of some of the fruits I include in my fruit shakes.
Except for the banana all the fruits below are ~50 calories per 100 grams or less which is a 1 to 0.5 gram to calorie ratio or lower.
For filler foods this is the gram to calorie ratio of the foods you should be eating.
85 Common banana
49 Orange, peeled
33 Honeydew melon
See my gram to calorie ratio list of bulk foods to see other low gram to calorie ratio foods.