EXPERTS have warned travellers not to eat this 50p food item or Irish having an upset stomach.
Passengers should steer clear of chewing gum while on a long-haul flight if they want to avoid feeling nauseous.
When we're at a high altitude our muscle contractions slow down, and the contents in the digestive system also move slower.
We swallow air every time we eat and drink, which causes our digestive tracts to fill with gas.
This causes people to feel gassy which is uncomfortable during an eight-hour flight.
Flying can be a lot smoother with the correct snacks, according to experts.
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Keeping hydrated is the most important factor for avoiding an upset stomach on long-haul journeys.
Passengers who are dehydrated risk suffering from nausea, headaches and jet lag.
Because of the lack of humidity in an aircraft, it is vital to increase your water intake.
Try to avoid ultra-processed foods and alcohol as these can be dehydrating.
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However, one rogue expert reckons a Bloody Mary cocktail is perfect for travellers to maintain hydration on a flight.
Stephanie Smith, a women’s health nutritionist for Agora Health, said: "If you do want to drink alcohol, opt for something like a single Bloody Mary – tomato juice is a source of electrolytes as well as being antioxidant-rich."
Nervous flyers should steer clear of caffeinated drinks, the experts claimed.
Travellers who enjoy a hot drink can order a hot cacao or herbal tea to avoid feeling bloated.
In addition, avoid eating salty food on long-haul flights as it can cause dehydration, headaches and fatigue.
Instead consuming fruits, nuts or your favourite dark chocolate will lead to a more comfortable experience.
Chocolate is known to be effective in reducing grogginess and the impact of jet lag.
Ashleigh Tosh, health and nutrition expert from Prepped Pots, revealed passengers should limit how many fizzy drinks they have, as too much could ruin their flight.
She also recommended choosing an aisle seat to make it easier to have a short walk which will help ease the uncomfortable feeling.
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It comes after a flight safety expert revealed why you should always sit at the back of the plane, even if you're in a rush.
And Ryanair passengers can get into the holiday mood on their flights with a new range of cocktails now being served on board.