Starting an extreme fast of more than 48 hours requires caution, especially if you have little experience fasting or have health problems. Here are some tips to help you get started safely: 1. **Consult your doctor**: It is very important to consult your doctor first, especially if you have any health problems or are taking medication. 2. **Be prepared**: - Reduce your food intake appropriately before you plan to start a long fast so that your body can gradually adapt to the reduced calories. - Make sure you consume enough nutrients and water a day or two before the fast. 3. **Stay hydrated**: Even during the fast, water is still necessary. You can drink water, tea or coffee, but avoid added sugar and dairy products. 4. **Monitor your body's reactions**: Pay attention to changes in your body. If you feel dizzy, extremely tired or unwell, you may need to end the fast. 5. **Stay active but not excessive**: Light exercise such as walking can help keep your energy up, but avoid strenuous exercise. 6. **Gradually resume eating**: After ending the fast, slowly resume food intake. Start with easily digestible foods such as soups, juices or soft foods, and gradually return to a normal diet. 7. **Pay attention to nutritional balance**: Maintain a balanced diet after fasting to ensure that the body gets the various nutrients it needs. Extreme fasting is not suitable for everyone, and the effects and reactions vary from person to person. The most important thing is to listen to your body and ensure safety and health are the top priority.