You'll also want people to RSVP so you have a head count for the caterer. If, on the other hand, your rehearsal dinner will be fairly low-key or small (think: a party at a restaurant or an intimate gathering at your future in-laws' home) then you don't need to be as official with your invitations.
The exact nutritional value of an orange depends on its variety. According to the U.S. Department of Agriculture, a standard-sized navel orange contains 69 calories, 17.6 grams of carbohydrates and 11.9 grams of sugar.
A medium-sized orange provides about 62 calories. Berries are generally lowest in calories. A half cup of raspberries provide just 32 calories and a half cup of blueberries provides about 41 calories. Many dieters eat half a banana to stay on the safe side and keep their calorie count in control. Half a banana would only provide 45-60 calories.