In 1954, similar blended fruit and vegetable drink preparations were published in by Dr. Alice Chase.
In 1955, similar blended recipes called Sunshine Cocktails were included in by G. Hauser.
Green Smoothie History
Big Band Leader Fred Waring
These are some examples of very early green smoothie recipes from 1940, just two years after the introduction of the Waring Blendor which was the first modern electric blender on the market. In 1954, the millionth Waring Blendor was sold.
In 1952, the recipes above were also published in a book titled by Mabel Stegner.