Don’t eat citrus fruit before a day in the sun! Because citrus contains compounds that make skin more vulnerable to UV light. A study in the Journal of Clinical Oncology followed 100-thousand people for 25 years. And skin cancer risk was highest in those who ate oranges and grapefruit daily, and lowest in those who ate it twice a week. But skin photosensitivity drops over time. So if you wait 4 hours after eating citrus to get some sun, you’ll cut your risk for skin cancer.