A broth fast, also known as a bone broth fast or a liquid fast, is a type of fasting where you consume primarily broth or other liquids for a designated period of time. While broth fasts are not as well-studied as other forms of fasting, they have gained popularity due to their potential benefits. Here are some potential benefits associated with broth fasting: 1. Nutrient intake: Broths made from bones, vegetables, and spices are rich in nutrients, including vitamins, minerals, and amino acids.