Long-term non-eating and drinking only water can cause serious harm to the body. The specific number of days that can maintain health varies from person to person, but it is usually not recommended to exceed 3 days. The following is a detailed analysis： --- ### **1. Short-term impact (1-3 days)** -**Energy source**: The body will first consume glycogen in the liver and muscles (which can be maintained for about 24-48 hours), and then it will break down fat and protein for energy. -**Symptoms**: Dizziness, fatigue, inattention, and hypoglycemia may occur, but they are usually not life-threatening. -**Water supplementation**: Adequate drinking water can avoid dehydration, but it cannot provide nutrition. --- ### **2. Medium-term risk (more than 3 days)** -**Protein breakdown**: Muscle tissue is broken down in large quantities, resulting in impaired organ function (such as heart muscle loss). -**Electrolyte imbalance**: Lack of minerals such as sodium and potassium may cause arrhythmia, convulsions and even coma. -**Metabolic decline**: The body enters the "hunger mode”, the basal metabolic rate decreases, and it is easy to rebound when resuming the diet in the future. --- ### **3. Long-term danger (more than 1 week)** -**Organ failure**: Long-term lack of nutrition can lead to liver and kidney dysfunction and collapse of immunity. -**Irreversible damage**: The nervous system and digestive system may be permanently damaged, which can be fatal in severe cases. --- ###**Key precautions** -**Individual differences**: Weight, body fat rate, and health status (such as whether there is a chronic disease) will affect the tolerance time. -**Absolutely contraindicated people**: Pregnant women, children, diabetics, and patients with metabolic diseases must not try. -**Scientific advice**: If short-term fasting is required (such as medical needs), it must be carried out under the supervision of a doctor and electrolytes must be supplemented. --- ###**Healthy alternatives** If the purpose is to lose weight or detoxify, consider： -**Intermittent fasting** (such as the 16:8 rule). -**Low-calorie diet** (intake of fruits and vegetables, high-quality protein). -Consult a nutritionist to develop a personalized plan. **Conclusion**: Extreme fasting is not advisable, the body needs a continuous supply of nutrients. If you have special needs, be sure to seek professional guidance.