Does Drinking Water During Meals Affect Digestion? What Gastroenterology and Ayurveda Actually Say — And Why Most People Have the Ancient Wisdom Backwards

This article examines the question of whether drinking water during meals affects digestion through six dimensions: the widespread myth and its origin; the gastroenterological science of parietal cell acid production, gastric juice volume (1,500-2,000 ml per meal), and why dilution at the level of a typical glass of water is physiologically insignificant; the documented benefits of water during and around meals (chewing and swallowing, peristalsis, nutrient dissolution, satiety and weight management); the correct reading of the Chanakya Niti shloka (Ajirne bheshajam vari — water is medicine in indigestion; Bhojane chamritam vari — water is nectar during meals; Bhojanante vishapadam — large water immediately after a meal is like poison) and its common misreading; the Ayurvedic distinction between water timing before, during, and after meals including Yogratnakar's 2:1:1 formula and Charaka Samhita on warm vs. cold water; the temperature question (cold vs. warm vs. room temperature) and its physiological implications; and the populations for whom specific guidance applies (GERD, gastroparesis, post-bariatric surgery, weight management). The governing argument: the science and the ancient wisdom are not in disagreement — both endorse moderate water during meals, both warn against excessive cold water, and the popular 'don't drink water with meals' advice misreads both the physiology and the Sanskrit.