Dealing with an upset stomach is one of the common concerns most travelers have while boarding a long-haul flight. Whether a person is traveling domestically or internationally, it is common to have an upset stomach, and sometimes, the symptoms may flare up, making it embarrassing for travelers to explain. To avoid such challenging scenarios and prevent health complications, here are some common foods and beverages to avoid having before boarding flights. Dairy products Long-haul flights, lasting more than 6 hours, can negatively affect one’s digestive system. Nausea, vomiting, and diarrhea are some common issues people experience with an upset stomach. It happens because the stomach contents get churned up with changes in altitude and cabin pressure. Furthermore, people who are lactose intolerant won’t be able to digest the sugars found in dairy entirely. This indigestion will lead to gas and bloating. Therefore, avoiding consuming dairy products on or before boarding a long-haul flight is best. Travelers must avoid fatty milk, cheese, milk curds, baked goods, and processed snacks made with milk or yogurt as the main ingredients before taking a flight. Cruciferous vegetables Broccoli, cauliflower, Brussels sprouts, and cabbage may be nutrient-dense. However, avoiding these items before boarding a flight is advised, mainly because these vegetables can cause gas.