Definite volume refers to something which has a consistent, unchanging volume, which in practical terms may mean a static mass and density, or a predetermined shape, either of which will dictate volume. A cube with side length l has a definite volume because it can only be exactly one size.
One cup of raw plantains or one medium sized raw plantain contains: ~180-200 calories, 0.5 g total fat, 47-50 g carbohydrates, 3.5 g dietary fiber, 22 g sugar and 2 g protein. Because of it's high carbohydrate content, you need to monitor your portion, otherwise your blood sugars will spike.
Beans contain a lot of starch and fiber, so they are often classified as starchy vegetables. For example, 1/2 cup of lentils or kidney beans has about 20 grams of carbohydrates, including approximately 8 grams of fiber, and 1/2 cup of chickpeas has 22.5 grams of carbohydrates, including 6.3 grams of fiber. For a diabetic, this would be about 1 1/2 15-gram carbohydrate servings.