What is the Military Diet? (Yes, it’s as tough as it sounds…)

Spencer Matthews was known as a typical playboy when he first shot to fame on Made in Chelsea. He actually toldCloser Online lots of juicy behind the scenes secrets about the reality show.

Fast forward several years and he dropped a tonne of weight and it's reportedly down to his strict diet and ditching the booze.

Stevi Ritchie shot to fame on The X Factor back in 2014 and after getting engaged to his wife Chloe Jasmine Whichello, they both went on Celebrity Big Brother.

Stevi shocked fans when he revealed he lost a whopping 20kg - just over 3 stone - in just eight weeks. He also opened up about how emotional his transformation has been.

Gogglebox favourite Scarlett Moffatt was well-loved for her bubbly personality, but had issues with her weight.

A year later, Scarlett underwent a huge weight loss - dropping from a size 18 to an 8. Read all about it here.

Model and presenter Kelly Brook has always had perfect hour glass curves, but she shrunk to a size 8 in 2010 when she became the face of Ultimo and appeared in American Playboy magazine.

Approaching her 40s as a happy and healthy size 12, Kelly has spoken about how she's just not bothered about staying a size 8 anymore. But she recently shared how putting weight on her famous big boobs might be causing a bit of a health issue.

We've always had a soft spot for Take Me Out presenter Paddy McGuinness. But recently...

He has been hitting the gym HARD and boy do the results look good!.

Shameless star and Celebrity Big Brother big mouth Tina Malone was a size 26 when she left the BB house in 2014.

But what a difference a gastric band makes. Tina lost a whopping 12.5 stone after an operation to reduce the volume of her stomach.

The Take That frontman shared this photo in February 2018 to remind himself how far he's come in his weight loss journey. Gary went up to around 16st after Take That split in 1996.

These days, Gary eats healthily and takes part in yoga every week. He now weighs less than 12st.

When Josie won Big Brother in 2010, she was a size 20 dress size and reportedly weighed 16st 17lb.

Josie famously went through a huge weight loss transformation in 2012, dropping to a size 8 and reportedly weighing 10st 2lb.

Mariah Carey stepped out in August 2017 with her boyfriend Brian Tanaka in New York.

Just three months later in October, she looked dramatically different - and was reported to have undergone liposuction.

Emmerdale actress Lisa Riley was known for her size 28 frame, but fans were pleasantly surprised by her sprightliness whilst on Strictly Come Dancing in 2012.

Lisa went under a huge lifestyle overhaul, losing a whopping 12 stone and dropping from a size 28 to a 12 before having her excess skin removed in 2017.

Everyone's favourite comedienne Dawn French previously weighed around 19st.

But in 2016, Dawn lost an incredible seven and a half stone - here's how she did it.

Controversial Katie Hopkins was a regular runner who gained a whopping 3st 5lb in just three months and weighed 12st. But Katie has always said there are 'no excuses' for people being overweight - so what happened?!

It turned out Katie's rapid weight gain was for a documentary to prove how easy it is for her to lose weight - which she did in just a few months. But we can't help but think it was all a bit of a, errr, pointless exercise?

TV chef Tom Kerridge weighed a dangerous 30st which he says was due to a lifestyle of late night drinking and overeating.

After a complete lifestyle overhaul, Tom shredded a staggering 12st - which is basically the same weight as another grown adult. Impressive work, Tom!

Corrie actress Brooke Vincent was already a petite size 10 but she wanted to give up smoking and get fit for Dancing on Ice.

And she did it! Brooke lost a dress size and showed off her seriously toned tum on Instagram. She also managed to kick her smoking habit. Yay!

Morning TV star Holly Willoughby has always had enviable curves and was a size 12 up until recently.

She looked noticeably slimmer in 2017 when Loose Women star Nadia Sawalha commented on it accidentally on live TV. Holly's secret to staying in shape is said to be a healthy lifestyle of pilates, kickboxing and a high vegetable diet.

Former TOWIE star Lauren Goodger has always battled with her yo-yo weight.

Following a tough 21 day juice cleanse at a retreat earlier this year, Lauren lost 1.4st.

khloe owns the kind of curves that can only belong to a Kardashian! She is the tallest sister in the fam at 5ft 9in and she reportedly weighed just over 11st in 2012.

Fast forward five years and Khloe shredded 30 pounds through a strict exercise regime and diet. She has spoken about how her split from Lamar Odom triggered her decision to hit the gym.

Singing sensation and The Voice judge Jennifer Hudson was a size 16 when she first came to our attention as the American Idol winner in 2007.

As her career grew her body shrunk after joining Weight Watchers and taking control of her diet. Jennifer dropped five dress sizes and today is a size 6.

In 2012 Xtina's womanly curves weighed 10 stone 7lb on her 5ft 1 frame and she wore a size 16.

The pop megastar dropped two stones by 2016 thanks to cutting out bad foods and being very strict with booze. But we're glad to see she's still rocking those curves!

Nation's sweetheart Cheryl Tweedy has always been super slim but she sparked concerns with her fragile frame during X Factor filming in 2015.

Cheryl quickly lost the pregnancy weight after giving birth to baby Bear in 2017. She was looking slim but strong at the Brit Awards 2018.

The hilarious Melissa McCarthy weighed just under 19st in 2014 after her brilliant performance in Bridesmaids.

5ft 2 Melissa lost an amazing 75 pounds through a very strict diet and exercise regime. She looks happier (and even more amazing!) than ever.

Actress Rebel Wilson defied the typical Hollywood body when she starred in Bridesmaids with fellow actress Melinda McCarthey.

In 2016 Rebel looked great after losing eight pounds at a fitness retreat in Malibu. By 2017 she'd lost an incredible 33 pounds!

Jonah Hill has always been the 'cuddly' character in films like Knocked Up, Forgetting Sarah Marshall and 21 Jump Street.

What a difference a year makes! He said he lost the weight and toned up by cutting out beer, seeking a nutritionist and getting tips from 21 Jump Street co-star Channing Tatum.

Chris Pratt has always been a total cutie...

But he transformed into an absolute hunk after losing 60 pounds and training for Guardians of the Galaxy.

Geordie Shore star Holly Hagan admitted to having a poor diet of junk food and booze when she weighed 13 stone and wore a size 16 in 2011.

Holly said she wasn't happy with her fluctuating weight and took a lifestyle overhaul to drop to a size 8. She also spent £6000 on a boob job.

The whole world fell in love with Sam Smith after releasing his debut album, but Sam has since said that he will always be self conscious of being in the public eye because he loves food so much.

Sam hired a nutritional therapist in 2015 and reportedly lost a stone in just two weeks. He then continued a healthy lifestyle by transforming his relationship with food - he's shredded 3.5 stone in total!

The Geordie Shore star's weight has always fluctuated but she went from a size 10 to a size 16 a year after being crowned the winner of Celebrity Big Brother.

She dropped to a size 6 before releasing her workout DVD in 2015. Recently, she spoke about how her breakup with Stephen Bear helps her keep a 'revenge' body.

After seeing unflattering bikini photos of herself at the beach, Geordie Shore's Vicky took dramatic steps and shrunk from a size 16 to a size 6 in five months.

The I'm A Celeb jungle queen is now a healthy size 10 and lives a balanced lifestyle, working hard on her fitness regime to be happier and healthier than ever.

Eastenders' Nat Cassidy grew up before our eyes and her weight was always changing. At one point, Natalie said she had size 6 - 16 clothes in her wardrobe. She even lost two stone in the three months after having her daughter.

Now a mum of two, Natalie looks a happy and healthy size after giving birth to her second daughter.

Frankie Essex is a another TOWIE star who has sometimes struggled to maintain a healthy weight.

The Essex girl has recently used a personal trainer and bootcamp workouts to shred a stone in just a couple of months. We think she looks fab!

X-Factor winner Joe McElderry won the nation's hearts with his cute smile and amazing voice in 2009.

He has transformed into a total gym BUFF while preparing for a West End role. He told Loose Women: 'I never promote anything apart from being healthy and fit. That is my message, doesn't matter what shape or size you are'

Living the rock and roll lifestyle took its toll on Ricky Wilson's weight, skin and general health. I predict a diet...

And we were right! We had to take a double look when he turned up to judge The Voice looking noticeably slimmer and healthier in 2014!

Tom has spoken about how he had a problematic relationship with food and depression because he felt like 'the fat one' in McFly. (Even though he was DEFINITELY our fave!)

But Tom is healthier than ever and even posts work outs that he does with his son Buzz - possibly the cutest gym buddy ever?!

Rob gained over 100lb while struggling with diabetes, depression and anxiety.

But Rob's recent Instagram posts like this suggest that he's lost the weight. He also posted a throwback to when he was bigger, along with the caption: 'I don't look like this anymore ud83dude02 #thetransformationiscoming #staytuned #nosurgery #putinwork'

Hollyoaks actress Jazmine Franks has always had a petite frame.

But the star now looks seriously lean after dedicating herself to a new fitness routine and healthier lifestyle.

The Emmerdale actress confessed to being addicted to sugary drinks and drinking a whopping FOUR litres per day.

After exercise and cutting out sugary drinks, Laura lost three stone within three years.

During Emma's first audition she told the judges she "couldn't do anymore" singing and after they told her she couldn't sing, her parents went on to confront them all. The dramz.

Fast forward 12 years since her first audition and Emma revealed after swapping junk food for a healthy lifestyle she dropped 12 stone in just two years.