A smoothie made with raisins, canned pineapple, yogurt, soy milk and frozen blueberries produces a liquid drink that coats the inside of the blender and then the glass. A smoothie made with the same items but fresh blueberries pours out of the blender in a clump and blender and glass hardly need washing. I wonder what science would explain here. This reminds me of what I once read where a gut doctor stated that drinking ice water caused a great deal of tummy upsets but few of his patients were aware of the cause and effect and simple solution.