Low-calorie foods and the concept of energy density
Simply put, energy density is the number of calories (energy) in a given
amount (volume) of food. For weight control, your best bets are healthy
foods that provide low energy but high volume. By choosing these
low-calorie foods, you can eat more and feel fuller on fewer calories.
Foods such as fruits and vegetables tend to be low in energy density —
they're low-calorie foods.
So what about raisins? They actually have a high energy density — they
pack a lot of calories into a small package. For example, 1/4 cup of
raisins has about 100 calories.