Anyone planning to jet off this Easter or beyond is being advised to steer clear of a very common airport snack before boarding. Plane food isn't everyone's cup of tea, and it's not always on offer during shorter flights, so grabbing something beforehand is vital.

However, travel experts at Ski Vertigo have warned that one particular type of food can make lengthy flights feel even more drawn-out, causing a lot of discomfort. They say the main culprit is the "grab-and-go" salty snack many travellers purchase at the gate, such as pretzels, crisps or salted nuts, as it can leave passengersfeeling bloated, thirsty and uncomfortable once the cabin doors shut. Aircraft cabins are extremely dry, which can worsen dehydration.

Low humidity at cruising altitude can leave you feeling dried out, which is why water is frequently the best option in the air. But salty snacks can make matters worse, since foods packed with sodium can prompt the body to retain fluid, contributing to puffiness and swelling - especially in the feet and ankles during longer journeys.

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That "tight shoes" sensation is typical after remaining still for hours, but what you eat can influence how uncomfortable it becomes. NHS guidance related to swelling often highlights reducing salt intake as part of managing fluid retention.

Alex Dyer, Head of customer success at Ski Vertigo, said: "People buy a salty snack because it's quick and it feels harmless, but on a flight it can leave you chasing water and feeling heavy. If you already get puffy ankles or feel rough when you fly, it is worth skipping it."

Airports also promote last-minute purchases, and salty snacks are dotted everywhere near the checkouts. A packet eaten just before boarding is more likely to take effect when you're buckled into your seat with limited opportunity to move about, especially if the seatbelt sign is illuminated, reports the Express.

Experts say the key thing is to drink water before and throughout the flight, and reduce caffeine and alcohol where possible, as dehydration can make travel feel more difficult.

For passengers wanting something to snack on, the experts recommend opting for choices that aren't as salty, like a banana or a cereal bar. Checking the label can be useful, because many 'snack size' products are still packed with salt.

The professionals added that the aim is not to ban treats, but to steer clear of the type that makes the cabin feel more uncomfortable, adding: "If you want the easiest flight, skip the salty snack before take-off, choose a sealed drink, and you will usually feel better by the time you land."