Does bone broth break a fast?

Calories in bone broth vary widely by brand. A 240 ml (8 fl oz) cup has anywhere from about 15 to over 100 kcal, and many sit around 40. Labels give figures per 100 ml, per 100 g or per serving, so check which one you are reading. Homemade broth has no label, so assume the higher end.

Against the site's own four goals, broth breaks autophagy and gut rest. The gut has food to digest, and broth carries protein. In lab and animal work, amino acids switch on mTOR, a sensor that slows autophagy, though nobody has tested a cup of broth in people. Weight loss is grey. A 40 kcal cup sits under the 50-calorie rule of thumb, and some brands go well past it. The database rates plain broth safe for blood sugar.

In the first days of a fast the kidneys pass more sodium, and some people drink broth on longer fasts to replace it. A pinch of salt in water does that with no calories. After a fast of 24 to 48 hours, the site's refeed planner suggests a small cup of broth before a normal meal.