1. Chronic sleep deprivation and staying up late
Sleep is the golden time for immune system repair. Prolonged late nights can significantly impair immune function. Even with sufficient sleep, missing the repair window between 10 PM and 2 AM will greatly reduce recovery efficiency.
 
2. Unbalanced diet and nutritional deficiencies
Picky eating, dieting, or long-term fast food consumption can lead to deficiencies in key nutrients like protein and vitamins, directly weakening immune function. High-salt and high-sugar diets can also disrupt gut flora, further reducing immunity.
 
3. Sedentary lifestyle and lack of exercise
Exercise promotes immune cell circulation, while prolonged sitting weakens immune function. At least 30 minutes of aerobic activity like brisk walking daily is crucial for maintaining immunity.
 
4. Excessive stress and negative emotions
Chronic stress suppresses immune cell activity, while a positive mindset can enhance immunity. Learning to relax and regulate emotions is key to maintaining immune balance.