The nutrition of a smoothie depends on its ingredients and their proportions. Many smoothies include large or multiple
servings of fruits and vegetables, which are recommended in a healthy diet and intended to be a meal replacement.
However, fruit juice containing high amounts of sugar can increase caloric intake and promote weight gain.
Ingredients such as protein powders, sweeteners, or ice cream may be used. One study found smoothies to be
less satiating, despite providing the same amount of energy as unblended foods.
Learn more on wikipedia