Prevent 90% of Illness Just by Washing Your Hands Well: Habits to Protect Your Body from Food Poisoning and Enteritis

The causes of sudden turmoil disorder described in Donguibogam—unclean food and dietary irregularity—align with modern medical understanding of acute gastroenteritis and food poisoning caused by bacteria, viruses, or parasites. These microorganisms enter the body primarily through contaminated food or water. The gut does far more than digest and absorb nutrients; it is a major immune organ often referred to as the second brain. Approximately seventy percent of the body's immune cells reside in the gut, alongside a complex network of neurons known as the enteric nervous system. This enteric nervous system communicates continuously with the brain through the gut-brain axis. This connection explains why emotional stress can trigger abdominal pain or diarrhea. When harmful bacteria enter the digestive tract through contaminated food or water, the immune system responds immediately. As intestinal mucosal cells become damaged and inflammation develops, the intestines swell, release pain mediators, and increase peristalsis. Diarrhea and vomiting are the body's physiological mechanisms to expel these harmful pathogens. Concurrently, immune cells such as leukocytes mobilize to combat the bacteria. The concept of upright qi in Donguibogam corresponds closely to this immune activity and gut resilience. A healthy gut functions like a protective barrier, preventing harmful bacteria from establishing themselves and neutralizing them quickly if they enter. Conversely, poor hand hygiene, leaving food at room temperature for prolonged periods, or eating unwashed, raw foods allows invisible bacteria and viruses to enter the mouth via ingredients, utensils, or hands. During the summer, high temperatures and humidity accelerate the proliferation of foodborne pathogens. If gut health is compromised or general immunity is reduced, the digestive system becomes significantly more vulnerable to infection. Modern medicine affirms that the most effective and fundamental preventive measure remains hygiene. Research consistently shows that proper handwashing alone can prevent up to ninety percent of infectious gastrointestinal diseases. Using fresh ingredients, maintaining clean cooking environments, and practicing consistent personal hygiene are the primary steps to supporting gut health and systemic immunity.