You'll need lightning sharp reactions to spot rogue food item in 17 seconds

Give your brain the workout of its life this weekend with this deceptively difficult brainteaser bound to leave you baffled. Contrary to popular belief,puzzles and riddlesaren't just an immature pastime to spice up your morning commute - or distract the kids on those hellishly long car journeys.

Research has shown they can actually positively impact the central nervous system, leading to a slew of benefits including better concentration levels. But unlike straightforward puzzle questions, like those in crosswords, brainteasers necessitate lateral thinking, which comes into play when the answer isn't immediately apparent and calls for an out-of-the-box approach.

READ MORE: You're a genius if you can solve baffling maths question in just 5 seconds

While some may find this type of puzzle challenging, for creative thinkers, brainteasers provide excellent mental stimulation. This healthy eating-themed brainteaser was launched following SunLife's revelation that 81 percent of Brits aren't consuming the recommended five portions of fruit and vegetables each day.

The goal of this new puzzle is to identify the 'unhealthy' item hidden amongst the illustrations of fruit and vegetables - but there's a twist.

To conquer the challenge, you must spot the unhealthy food within 15 seconds, a task that has proven to be quite tricky. Hidden amongst tiny illustrations of bananas, apples, cherries, strawberries, kiwi, mango, passion fruit, grapes, oranges, melon slices, blueberries, pears, raspberries, and lemons, is a piece of cheese, cleverly camouflaged among the fruit.

We're not giving away any clues for this one, but zooming in on the image may help you find the answer quicker. If you're still feeling completely lost, you can scroll down to the bottom of the article to find the answer.

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If that brainteaser was no matched for an eagle-eyed individual like yourself, do not worry. Now, it's time to ramp things up a notch with this tricky pub-quiz brainteaser that's much harder than it first seems.

Each question has been strategically designed to trip you up, so don't get too cocky and make a silly mistake. You only have three seconds on each question before you need to move on to the next and need to score at least eight out of 10 to prove you're a genius.

If you're not good with strict time limits, take as long as you need to answer each question - and aim for top marks. Once you're done, you can check your answers here, but no cheating!

What is the world's most popular social media platform by monthly active users?

What is the smallest country in the world?

How many planets are in our solar system, excluding Pluto?

What is the name of the world's longest river?

How many hearts does an octopus have?

What is the chemical symbol for gold?

What is the largest living organism on Earth?

What element forms the majority of the world's atmosphere

In what year was the first iPhone released?

What is the scientific name for the process by which plants convert sunlight into energy?

Up for another challenge? Check out our collection of tricky brainteasers, riddles, and puzzles here. Or, learn more about your hidden personality traits with these mind-boggling optical illusions.

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