If your smoothie is made with fat-free yogurt, juice, bananas and pineapple it is really a blood sugar spiking shake instead of a meal or adequate snack.
Making a protein smoothie?
Get the most out of your smoothie, especially if you are using it as a meal replacement shake.
Smoothies as a Meal Replacement
This one is fairly low carb!
I use a VitaMix blender and make 2 quarts of smoothie, drink one quart per day.