Dr. Jason Fung’s fasting protocols often include intermittent fasting methods, like the 16/8 method (16 hours of fasting and an 8-hour eating window), 24-hour fasts once or twice a week, or longer fasts such as 48 or 72 hours, often termed as prolonged fasting once a month or so.

While fasting, it's important to stay hydrated. Consuming calorie-free beverages like water, black coffee, and green tea can be beneficial. Here's how you can incorporate green tea:

You can have several cups of green tea throughout your fasting period. Green tea can be a good source of hydration and may help suppress appetite due to its mild caffeine content.

Sipping a cup of warm green tea can be a gentle way to break your fast before having your first meal.

As for bone broth, this is a bit of a gray area. Traditional fasting purists would argue that any caloric intake breaks a fast. However, some fasting protocols (including some suggested by Dr. Jason Fung) allow for a small number of calories during the fasting window, often from bone broth. The rationale is that the minimal caloric intake does not significantly impact the overall metabolic state of fasting.

Bone broth, especially one that you simmer slowly for 24-48 hours, can be rich in nutrients and electrolytes, which can help keep you nourished during a fast and can aid in maintaining electrolyte balance.

Remember, everyone's body is different and reacts to fasting in its own way. Monitoring how your body responds is crucial. If you feel dizzy, weak, or unwell during a fast, it's essential to listen to your body's cues and consider breaking the fast or seeking medical advice.

Finally, it's important to note that prolonged fasts (over 24 hours) should be undertaken with caution and preferably under the supervision of a healthcare professional or a dietitian experienced in therapeutic fasting.