Social & Preventive Medicine Nutrition and health a13e3c7a On exposure to sunlight which vitamin is lost - A Vitamin A B Vitamin B1 C Vitamin B6 D Vitamin C High-Yield Explanation Vitamin C is the most sensitive of all vitamins to heat. (REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 621)