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Everyone knows that if you want to lose weight you have to give up your favourite fast food treats, right?

Well, wrong, according to The Fitness Chef, AKA Graeme Tomlinson.

Former personal trainer, Graeme, who has now released his own diet book, Eat What You Like and Lose Weight For Life, insists that with a few simple hacks you can HALVE the calories in your favourite fast food treats.

So if you fancy a quick McDonald's, no problem, you just need to make a tiny change.

And it's the same with Burger King and KFC.

(Image: thefitnesschef_/Instagram)

Graeme explained: "When one selects large portion sizes they may be best placed to ask themselves if this is truly required.

"If the answer is yes, then so be it. But if the answer no, one may do so in the knowledge that significant calorie savings can be achieved over time by selecting the smaller equivalents.⁣"

Basically, that means the next time you pop out for a burger, fries or a spot of fried chicken, ask yourself 'do I really need to go large?'

For example, if you head to McDonald's and order a large coke, a grand Big Mac and a large fries, it'll be a massive 1,387 calories.

But, and you'll hardly notice the difference, if you order a Coke Zero, Big Mac and medium fries, it'll add up to just 845 calories.

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Next up, Burger King. If you order a large strawberry milkshake, a double whopper and large fries, that'll be 2,111 calories, more than most people should be eating in a day.

However, if you switch your order to a small strawberry milkshake, regular fries and a normal whopper, you'll eat just 1,338 calories.

And on a trip to KFC if you choose a mighty bucket for one, large BBQ beans and a large Pepsi that'll be 1,585 calories.

However, if you order a large Pepsi Max, large popcorn chicken and regular BBQ beans, it'll be just 570 calories.

Graeme, who has hundreds of thousands of followers on Instagram, is a man on a mission to get people to ditch fad diets.

He insists everyone can lose weight without giving up their favourite foods, including pizza, chocolate and ice-cream.

The 32-year-old stresses the key thing is to keep track of how many calories you're eating and make sure you consume fewer than you use.

And it doesn't matter where you get those calories from.

Graeme said: "I wanted to break it down so people can understand it.

"There is so much rubbish out there and I wanted to tell them that there's only one way you can lose weight and that's with a calorie deficit.

(Image: thefitnesschef_/Instagram)

"People feel deprived and that's when they give up and start to binge - but you don't need to feel deprived."

This means you don't have to eat nothing but chicken and broccoli if you want to shed the pounds, you can still have a slice of cake or a biscuit.

Worried about going out for pizza? Don't be, just eat fewer calories the day before and the day after.

Or make sure you opt for a small, rather than a large - fewer calories but all of the taste.

Graeme admits it can take some getting used to at first but stresses it soon becomes second nature.

And his one piece of advice when it comes to eating to lose weight "the best diet for people to follow is the one they can stick to".