A Zurich-based gastroenterologist, Joachim Mertens, cautions travelers about potential health risks during vacations. He emphasizes the dangers posed by pathogens found in food and drinks, specifically highlighting fruits and tap water. While relaxed on holiday with his own family, Dr. Mertens maintains certain non-negotiable precautions regarding consumption. The risks can be significant enough to “ruin your entire vacation.” The specific dangers from contaminated sources aren’t detailed in this excerpt, but the warning signals the importance of mindful eating and drinking while travelling. Travelers should prioritize safe food and water sources to avoid illness and ensure an enjoyable trip.