Who invented liquid diets?

Liquid diets have been used in various forms for centuries, but they gained popularity in the modern era due to the work of Dr. Nathan Pritikin in the 1970s, who promoted liquid meal replacements for weight loss and health. Additionally, the concept of using liquid diets for medical purposes, such as in the management of obesity or certain health conditions, has evolved over time with contributions from various nutritionists and medical professionals. While there isn't a single inventor of liquid diets, these figures played significant roles in their development and popularization.