So, what is a smoothie? In Wikipedia: A smoothie (occasionally spelled smoothie or smooth) is a thick, cold beverage made from puree raw fruit (and occasionally vegetable) mixed with ice-cream or frozen yogurt together with other ingredients such as water, crushed ice, fruit juice, sweeteners, (e.g. honey, sugar, Styria, syrup) dairy products ( e,g. milk, yogurt or cottage cheese, whey powder) plant milk, nuts, nut butter, seeds, tea, chocolate, herbal supplements or nutritional supplements.
A smoothie containing dairy products is similar to a vegetable milkshake, though the latter typically has less fruit and often has ice-cream or frozen yogurt.
As you can tell by the definition you are ready to do a lot about the components you choose to put in your smoothie. But not all ingredients blend well together. Ingredients may very as much as the purpose of the smoothie you have chosen to make. For a protein energy increase, weight loss, wellness, breakfast drink or just refreshment.