Group 1 - The core idea of the article emphasizes that the gut is crucial for immune health, with approximately 70% of immune cells located in the gut, making it the "main battlefield" for immunity [1] - Improving immunity is described as a long-term project centered around gut health, rather than relying solely on supplements for quick results [1] - The article advises individuals experiencing chronic fatigue, weight loss, or abnormal bowel habits to seek consultation from a digestive specialist [1]