Is fake meat healthy? Dr Christian Jessen spills the beans

Gogglebox's Jonathan Tapper was previously 21st 3lbs, but he slimmed down to 18st 8lbs after being diagnosed with diabetes in 2015.

The Channel 4 star dropped 3 stone in 12 weeks and the North Londoner reckons he was consuming over 3,000 calories a day. He has now reduced his intake to 1,800 daily in order to keep the weight off, ensuring that he exercises too.

Susanna previously admitted on Good Morning Britain that she lost weight due to health issues. She explained: "It was a combination of factors, but a doctor said I was at the top end of my BMI."He said it might benefit me if I lost a little weight."

She pretty much looks the exact same but has confessed she's cut the booze and snacking. Piers Morgan has also said she's "never been happier".

Tommy has long been our number one boy hun on TOWIE. He transformed himself from cuddly sweetheart...

...to ripped DEMI GOD. Tommy credited his new physique to an intense daily exercise regime and healthy eating plan.

American former adult film star Jenna Jameson stormed British TV screens on Celebrity Big Brother in 2015.

She put on some pounds following the birth of her children and astonished fans when she shared incredible before and after pictures, revealing she'd dropped 80lb.

Love Island 2017 cast mate Tyne put on two stone after appearing in the looking-for-love show. She still looked simply stunning, mind.

Tyne shed inches using a combination of Shake it Slim meal replacements and some pretty hardcore work out routines. Go, Lexi!

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 while 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.

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.

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 fairly 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.

Johnny Vegas was long known for his fuller figure as well as his funny way with words, and that relationship with a tea loving monkey.

Johnny unveiled his trim new look on Instagram after dropping a whopping three stone through following a healthy eating and fitness plan.

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.

Big Brother star Chanelle Hayes is infamous for her changing frame. In 2018 she documented her weight loss following the birth of her second son Frankie.

Chanelle told her followers: "I am absolutely BUZZING at my progress so far. Slow and steady is definitely winning the race..."

Alan Halsall, who plays Tyrone Dobbs in Coronation Street, has always had fans but he upped his game from cute and cuddly to all out FITLORD in 2018.

The charming actor posted a svelte looking snap to his Instagram account and fans went wild for his new look.

Jack Branning actor Scott Maslen has always been a bit of a heartthrob on the Square.

But we never knew THIS was hiding under those suits. The star admitted to being addicted to working out recently on his Instagram.

TOWIE star Courtney Green has always looked fab and we first saw her on our TV screen back in 2016.

Following her split with Myles Barnett she showed him and her thousands of Instagram followers what he's missing. Go girl!

Corrie's Catherine Tyldesley has been very open about her weight loss transformation and regularly documents her workouts at the gym on Instagram.

After leaving Coronation Street, the actress decided to take a 12 week transformation challenge and she looks amazing!

He's played innocent and lovely Sam Dingle since 1995 but fans couldn't believe it when he shared a topless photo in 2018...

So that's what Sam Dingle looks like underneath that infamous green jacket. The Emmerdale actor looks AMAZING.

At 6 ft 1, Paddy McGuinness has always been the kinda guy you just want a big old bear hug from!

Over recent years, the Take Me Out presenter has been influenced by his fitness fanatic wife Christine to hit the gym in their Cheshire home. He dropped from 14 stn to 13 stn 9 lb in 2018, saying he's happy with his size.

Gemma has always been mega-glam, but her weight has fluctuated over the years and she'd admitted that she often feels self conscious around her ultra slim TOWIE co stars.

After a vigorous few months training for Dancing on Ice, the GC earned a legion of new fans, but lost a whopping two stone!

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.