Once weighing in at 27 stone, it’s been reported that the the quiz show extraordinaire dropped three stone last year – and it seems Mark’s waistline is continuing to shrink.
Quiz-goers at The Cleveland Bay pub in Stockton-On-Tees couldn’t help but notice the dramatic difference in the TV star.
Joining the pub quiz, naturally – in honour of the pub’s champion quiz team The Four Tops, winners of the Great British Pub Quiz earlier this year – Mark lent his intellectual powers to assist different teams in each round, but it was his incredible body transformation that got chins wagging.
Check out: Loose Women cast
Closer Loose Women cast - Slider with cover pic
Swipe through to find out all about your favourite Loose Women...
Loose Women: Ruth Langsford
Ruth Langsford has been on Loose Women on and off since its inception in 1999. Featuring as a guest panellist in 1999, she became a regular in 2000 for a year. She returned in 2009 until 2010, before being made a presenter in 2012 and now anchors the show when she's on - sitting in the all important first seat.Ruth also guest hosts This Morning on Fridays with her husband Eamonn Holmes, and stands in for regular presenters Holly Willoughby and Phillip Schofield during holidays.
Loose Women: Andrea McLean
Andrea McLean has been a presenter since 2007. Of all the current Loose Women, she's the most prolific - having appeared in a whopping 1,139 episodes as of 25 April 2018. She serves as the main presenter when on the show.Aside from Loose Women, Andrea was formerly a weather presenter on GMTV for 10 years, and was also a contestant on Dancing On Ice in its first year back in 2006.
Loose Women: Christine Lampard
Christine Lampard (formerly Bleakley) is the third regular anchor of the show and also enjoys first-seat responsibilities. Having joined the show as a presenter in 2016, Christine has appeared in a respectable 59 episodes of the show as of 25 April 2018 - but she's got a bit of catching up to Andrea to do!She first became well known after presenting BBC's The One Show alongside Adrian Chiles in 2007, leaving the show in 2010. She presented Dancing On Ice from 2012 to 2014 with Phillip Schofield after Holly Willoughby left, and she occasionally stands in for Lorraine Kelly on her show.
Loose Women: Kaye Adams
Kaye Adams is one of the longest-serving members of Loose Women who still appears on the show, having originally joined in 1999. Having started out her Loose Life on the show as a main presenter, she left in 2006, but returned as a panellist in 2013. The Scottish journalist presents The Kaye Adams Show on BBC Radio Scotland every weekday from 9am to 12pm, and also took part in Celebrity Masterchef in 2008.
Loose Women: Jane Moore
Jane Moore is also a long-standing member of the Loose Women panel, having joined the show in 1999 too. After leaving in 2002, she also returned in 2013 along with Kaye Adams, Nadia Sawalha and Coleen Nolan.Alongside her Loose duties, Jane is a columnist for The Sun newspaper, and also appears on The Andrew Marr Show as a newspaper reviewer.
Loose Women: Nadia Sawalha
Yet another returnee, Nadia was also an original panellist - joining the show in 1999 when it first started. After leaving in 2002, she returned in 2013 along with Kaye Adams and Jane Moore.Aside from Loose Women, Nadia is best known for her two-year stint in EastEnders as Annie Palmer, and forging a new culinary career following her Celebrity MasterChef win in 2009. She's also competed on Dancing On Ice and Celebrity Big Brother.
Loose Women: Coleen Nolan
Coleen Nolan first appeared on Loose Women in 2000, before returning in 2004 until 2011. She rejoined the cast in 2013, along with Kaye Adams, Jane Moore and Nadia Sawalha. After Andrea McLean, she is the most prolific Loose Women, having appeared in 1,111 episodes as of 25 April 2018.Coleen rose to fame as part of her family's singing group, The Nolans, along with her sister Linda Nolan who also frequently appears on the show. She took part in Dancing On Ice in 2009, and was also previously a presenter on This Morning. Coleen has also been in the Celebrity Big Brother twice, first coming runner-up in 2012, and winning in 2017.
Loose Women: Janet Street-Porter
Janet Street-Porter has been a regular face on the Loose Women panel since 2011. Known for her sharp tongue, Janet has appeared in 554 episodes of the show as of 25 April 2018. Janet, who was awarded a CBE in 2016 for services to journalism and broadcasting, has previously worked in fashion magazines. She took part in I'm A Celebrity... Get Me Out Of Here! in 2004 and came third in Celebrity MasterChef in 2013.
Loose Women: Linda Robson
Linda Robson first appeared as a guest panellist on Loose Women in 2003, having brief stints in 2010 and 2011 before joining full-time in 2012. Best known as Tracey Stubbs in Birds of a Feather between 1989 and 1998 as well as taking part in the reboot in 2014, Linda also had a stint in the I'm A Celeb! jungle in 2012.
Loose Women: Gloria Hunniford
Gloria Hunniford has appeared as a regular panellist on Loose Women since 2014, having previously appeared as a guest panellist in 2003 too. At 78, Gloria is the oldest current panellist on the show.No stranger to the TV circuit, Gloria took part in Strictly Come Dancing 2005, making it to Week 3 before being voted out.
Loose Women: Penny Lancaster
Penny has been a Loose Woman since 2014, having previously never been on the show before. Penny had a big moment on the show in 2017 in the wake of the Harvey Weinstein scandal when she bravely revealed that she'd been drugged and raped as a teenager - and a virgin.Best known as a model, Penny is also well-known for being the wife of Rod Stewart, with whom she shares two children. She also appeared on Strictly Come Dancing in 2007, leaving in the sixth week.
Loose Women: Saira Khan
Saira Khan first joined the Loose Women cast in 2015 alongside Katie Price. She too revealed on Loose Women that she'd been sexually assaulted as a young girl, and helped to raise awareness for the issue.Saira first rose to fame after competing on the first ever series of The Apprentice in 2005, coming second. She also appeared on Celebrity Big Brother in July 2016, and was the second to be voted out.
Loose Women: Katie Price
Katie Price joined the cast of Loose Women in 2015 alongside Saira Khan, having previously been a guest panellist in 2011 and 2014. However, her status as a Loose Woman is under scrutiny at the moment as she hasn't appeared on the show since January.Pricey is of course, well known outside of Loose Women. She first became known as a glamour model under the alias Jordan in 1996, first appearing on Page 3 of The Sun at the age of 18. Since then, she's become a reality star in her own right, and her relationships are often the subject of tabloid speculation.
Loose Women: Stacey Solomon
Stacey Solomon first joined the Loose Women in 2016 after appearing as a guest panellist between 2011 and 2012. The mum-of-two joined the show alongside Lisa Riley and Anne Diamond.Stacey won her celebrity status after competing in The X Factor in 2009 at the age of 20. She came third in the competition. Stacey became Queen of the Jungle in the 2010 series of I'm A Celebrity... Get Me Out Of Here!, and is currently in a relationship with former King of the Jungle, Joe Swash.
Loose Women: Lisa Riley
Lisa Riley became a Loose Woman in 2016 alongside Stacey Solomon and Anne Diamond. The former Emmerdale actress was absent from the show for a number of months after undergoing surgery to remove excess skin following a 12-stone weight loss.Lisa was well-loved as Emmerdale's Mandy Dingle, playing the role for over seven years. She also took part in Strictly Come Dancing in 2012, and is known for being the standout star of the competition that series.
Loose Women: Anne Diamond
Anne Diamond joined the Loose Women panel in 2016 with Lisa Riley and Stacey Solomon. She's a lesser-spotted Loose Woman, having only appeared in 58 shows as of 25 April 2018. Anne carved her career in journalism, hosting Good Morning Britain and is a regular columnist for the Daily Mail. Having tragically lost her third child, Anne successfully campaigned for research into cot death, and reportedly cut cot deaths in the UK from 2,000 to 300. She also appeared on Celebrity Big Brother in 2002, and was the second to be evicted.
Loose Women: Denise Van Outen
Denise Van Outen joined the cast of Loose Women full time in 2017, having been a guest panellist in 2014 and 2017 previously. Although she is relatively new to the show, she's already won a place in the hearts of Loose Women viewers.Denise has been on various TV shows in her time, but most notably took part in Strictly Come Dancing in 2012 with fellow Loose Woman Lisa Riley. She made it to the final of the show with her partner James Jordan, and they finished as runners-up to Louis Smith.
Loose Women: Kelly Brook
Kelly Brook is the most recent addition to the Loose Women panel, having joined the show in 2018. She has previously appeared on the show as a guest.Kelly is best known for her modelling career which began when she was age 16. She is also a regular panellist on Celebrity Juice, and also took a turn on Strictly Come Dancing in 2007.
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Back in 2017, medics diagnosed Mark with Type 2 diabetes – a condition that is linked to obesity.
Appearing on Loose Women, the 54-year-old shared his fears for his wellbeing and the motivation behind his body overhaul.
“It was the diabetes,” he confessed. “I’m waiting for my next check-up and I’m hoping the figures are going to be better.”
After completely cutting out sugar from his diet, there’s no doubt that Mark is most definitely looking trimmer. But the quiz master attributed his newfound stature to “running around after an active two-year-old”.
The toddler in question is his little boy, who he shares with his wife of five years, Katie Labbett.
Although his 26-year-old wife confessed to an affair in May, Katie and Mark are now back together after separating for a short while during the summer.