It’s an image you’ve probably seen countless times on your socials. Someone relaxing with cucumber slices over their eyes. And it’s become synonymous with self-care and relaxation.
Spa vibes aside, there are various claims online about the fruit - yes, it’s a fruit and NOT a vegetable – everything from cucumbers being good for eyes and skin, to them having negative calories. BBC Other Side of the Story has taken some popular beliefs about cucumbers and turned them into a fact-check salad.
CLAIM: Cucumbers can help puffy eyes - TRUE
For years, people have claimed that cucumbers can soothe the skin around your eyes, especially if it's feeling dry or puffy. And, perhaps surprisingly, there is some science behind those claims.
According to the US health website Healthline, cucumbers are made up of about 96% water and contain beneficial nutrients like vitamin C, vitamin K, potassium, and fibre.
There's also evidence that the cooling sensation of chilled cucumbers can provide temporary relief for tired, puffy eyes. Dr Sam Bunting, cosmetic dermatologist says the main benefit comes from their temperature rather than any special skincare properties. "Cucumber slices may help reduce mild under-eye puffiness, but the effect is temporary. The main benefit comes from their cooling temperature, which constricts blood vessels and can reduce swelling for a short period."
While cucumber slices may temporarily make the eye area look fresher by reducing puffiness, Dr Sam says there's little evidence they can "treat wrinkles, boost collagen, or permanently improve dark circles". The benefit is mainly for the skin around the eyes rather than the eyes themselves.
So, while the cucumber-eye trick isn't entirely a myth, experts say it's best viewed as a simple comfort measure rather than a proven skincare treatment.
CLAIM: Cucumbers have negative calories - FALSE
Cucumbers, like celery, are sometimes described as having negative calories. The idea is that our bodies use as much (or more) energy to digest a chosen fruit or vegetable as the energy it provides.
Dr Emma Davies explained in an article for BBC Science Focus: "There's no scientific evidence for this food fad, with even the lowest calorie foods, such as celery and watercress, containing more energy than the body needs to process them."
It's not all bad news for cucumber fans, though. Cucumbers are still a healthy snack choice. According to BBC Good Food, a 50g serving contains just 15 calories, but they're also packed with antioxidants and may help keep blood sugar levels in check. Plus, because they're around 96% water (remember?), they're great for staying hydrated too.
CLAIM: Cats are scared of cucumbers - MAYBE
A strange social media trend involves secretly placing a cucumber behind a cat. When the cat turns around and spots it, it often jumps in surprise. But that doesn't necessarily mean cats are scared of cucumbers.
According to Dr Pamela Perry, a cat behaviour expert at Cornell University in the US, the cats in these videos are probably just surprised by an object appearing behind them. She also says there's no evidence that cats mistake cucumbers for snakes.
“Cats don’t have a natural fear of snakes,” she explained. “In fact, a lot of them hunt snakes.”
Dr Perry’s theory is that cats who are more likely to be fearful will react in an extreme way when they spot a cucumber that wasn’t there before - or any object. It’s down to their individual personality more than anything else. She doesn't recommend trying the cucumber trick at home, as being startled in this way can cause unnecessary stress and isn't enjoyable for cats.
It’s always important to check multiple sources when it comes to theories such as animal behaviour. A video featured on the Scientific American website showed an animal behaviour expert place different fruit and veg, including a cucumber, celery and a potato, in front of a cat - which seemed to ignore every single item!
So, while some cats may react dramatically to cucumbers, there's not enough evidence to say that cats as a whole are scared of them. More research is needed before that claim can be treated as fact.
What can cucumbers teach us about fact-checking?
From beauty hacks to funny cat videos, social media is full of surprising claims. Some turn out to be true, some are exaggerated and others are completely false.
That's why it's important to ask questions before believing or sharing something online:
• Who is making the claim?
• What evidence do they provide?
• Do experts agree?
• Have other trusted sources reached the same conclusion?
Just because something goes viral doesn't mean it's true. Popularity isn't proof, and the best way to separate fact from fiction is to look at the evidence.
This article was published in June 2026
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