Simon Cowell sheds 20 pounds: See his trimmed down physique!

Simon Cowell has lost "about 20 pounds," and he has his newfound vegan diet to thank for it.

The "America's Got Talent" judge recently appeared on "Extra," where ex-girlfriend Terri Seymour interviewed him about the upcoming season of the NBC competition show, which boasts two new judges in Gabrielle Union and Julianne Hough.

SEE ALSO: Sharon Osbourne says Simon Cowell 'fired' her for being too 'old'

The conversation turned to the fact that Cowell turns 60 in October, and he reflected on going vegan, which was a change that allowed him to lose 20 pounds, leaving him feeling "much better."

17 PHOTOS
Simon Cowell out and about in recent years
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Simon Cowell out and about in recent years
HOLLYWOOD, CALIFORNIA - AUGUST 13: Simon Cowell arrives at the "America's Got Talent" Season 14 Live Show at Dolby Theatre on August 13, 2019 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CALIFORNIA - AUGUST 13: Simon Cowell arrives at the "America's Got Talent" Season 14 Live Show at Dolby Theatre on August 13, 2019 in Hollywood, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CALIFORNIA - MAY 04: Simon Cowell attends City Year Los Angeles' Spring Break: Destination Education at Sony Studios on May 04, 2019 in Los Angeles, California. (Photo by Rachel Murray/Getty Images for City Year Los Angeles )
AMERICA'S GOT TALENT -- Season: 14 -- Pictured: Simon Cowell -- (Photo by: Art Streiber/NBC/NBCU Photo Bank via Getty Images)
AMERICA'S GOT TALENT -- Season: 14 -- Pictured: (l-r) Howie Mandel, Gabrielle Union, Simon Cowell, Julianne Hough, and Terry Crews -- (Photo by: Art Streiber/NBC/NBCU Photo Bank via Getty Images)
PASADENA, CALIFORNIA - MARCH 11: Simon Cowell attends NBC's "America's Got Talent" Season 14 Kick-Off at Pasadena Civic Auditorium on March 11, 2019 in Pasadena, California. (Photo by Presley Ann/FilmMagic)
LONDON, ENGLAND - FEBRUARY 04: Simon Cowell and Lauren Silverman seen leaving the Arts Club in Mayfair on February 04, 2019 in London, England. (Photo by GOR/GC Images)
LONDON, ENGLAND - JANUARY 22: Simon Cowell seen leaving "Britain’s Got Talent" auditions on January 22, 2019 in London, England. (Photo by Ricky Vigil/GC Images)
BRIDGETOWN, BARBADOS - JANUARY 08: Simon Cowell seen getting on a jet ski on January 08, 2019 in Barbados, Caribbean. (Photo by Ian Lawrence/GC Images)
LONDON, ENGLAND - OCTOBER 29: Simon Cowell and Lauren Silverman attend the Pride of Britain Awards 2018 at The Grosvenor House Hotel on October 29, 2018 in London, England. (Photo by Jeff Spicer/Getty Images)
PASADENA, CALIFORNIA - OCTOBER 17: Simon Cowell attends the 'America’s Got Talent: The Champions' Finale at Pasadena Civic Auditorium on October 17, 2018 in Pasadena, California. (Photo by Tibrina Hobson/WireImage,)
PASADENA, CALIFORNIA - OCTOBER 10: Simon Cowell attends NBC's "America's Got Talent: The Champions" at Sheraton Pasadena Hotel on October 10, 2018 in Pasadena, California. (Photo by Presley Ann/Getty Images)
AMERICA'S GOT TALENT: THE CHAMPIONS -- "Champions One" Episode 101 -- Pictured: (l-r) Howie Mandel, Mel B, Heidi Klum, Simon Cowell -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
HOLLYWOOD, CA - SEPTEMBER 20: Carrie Underwood and Simon Cowell attend the ceremony honoring Carrie Underwood with a Star on The Hollywood Walk of Fame held on September 20, 2018 in Hollywood, California. (Photo by Michael Tran/FilmMagic,)
HOLLYWOOD, CA - SEPTEMBER 19: Simon Cowell attends "America's Got Talent" Season 13 Finale Live Show Red Carpet at the Dolby Theatre on September 19, 2018 in Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
HOLLYWOOD, CA - SEPTEMBER 11: Simon Cowell attends T"America's Got Talent" Season 13 Live Show Red Carpet on September 11, 2018 in Los Angeles, California. (Photo by JB Lacroix/GettyImages)
HOLLYWOOD, CA - SEPTEMBER 04: Simon Cowell arrives at the "America's Got Talent" Season 13 Live Show Red Carpet at Dolby Theatre on September 4, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
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Cowell's diet change came after he fell down the stairs at his home in October 2017, which he would later reveal happened after he fainted because of low blood pressure.

"Sometimes we get a reminder that we’re not invincible and this was certainly mine. It was a huge shock. They think I fainted because I had low blood pressure and so I have got to really take good care of myself to sort that out," Cowell told The Sun. "After all, I am a dad and have more responsibility than ever."

Cowell shares son, Eric, 5, with longtime girlfriend, Lauren Silverman.

This spring, in a new interview with The Sun, the former "American Idol" judge joked that his appearance has drastically improved since he cut out meat, dairy, wheat, sugar and fish.

"If I was on a one to ten scale of being handsome, I was an eight and now I’ve gone to an 11," he joked.

21 PHOTOS
Simon Cowell and Lauren Silverman together
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Simon Cowell and Lauren Silverman together
LONDON, ENGLAND - OCTOBER 29: Simon Cowell and Lauren Silverman attend the Pride of Britain Awards 2018 at The Grosvenor House Hotel on October 29, 2018 in London, England. (Photo by Jeff Spicer/Getty Images)
LONDON, ENGLAND - OCTOBER 29: Simon Cowell and Lauren Silverman attend the Pride of Britain Awards 2018 at The Grosvenor House Hotel on October 29, 2018 in London, England. (Photo by Jeff Spicer/Getty Images)
LOS ANGELES, CA - AUGUST 22: Simon Cowell and Lauren Silverman are seen on August 22, 2018 in Los Angeles, CA. (Photo by SMXRF/Star Max/GC Images)
LOS ANGELES, CA - AUGUST 22: Simon Cowell and Lauren Silverman are seen on August 22, 2018 in Los Angeles, California. (Photo by BG023/Bauer-Griffin/GC Images)
HOLLYWOOD, CA - AUGUST 22: Simon Cowell and Lauren Silverman attend the ceremony honoring Simon Cowell with star on the Hollywood Walk of Fame on August 22, 2018 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CA - SEPTEMBER 20: Simon Cowell sits with Lauren Silverman at Carrie Underwood Star Ceremony On The Hollywood Walk Of Fame held on September 20, 2018 in Hollywood, California. (Photo by Albert L. Ortega/Getty Images)
HOLLYWOOD, CA - AUGUST 22: Simon Cowell, Lauren Silverman, Eric Cowell and Adam Silverman attend a ceremony honoring Cowell with a star on the Hollywood Walk of Fame on August 22, 2018 in Hollywood, California. (Photo by Rich Fury/Getty Images)
HOLLYWOOD, CA - AUGUST 22: Simon Cowell, Lauren Silverman, Eric Cowell and Adam Silverman attend the ceremony honoring Simon Cowell with star on the Hollywood Walk of Fame on August 22, 2018 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LONDON, ENGLAND - JULY 09: Simon Cowell and Lauren Silverman seen attending Syco - summer party at Victoria and Albert Museum on July 9, 2018 in London, England. (Photo by Ricky Vigil/GC Images)
LONDON, ENGLAND - JULY 06: Simon Cowell (L) and Lauren Silverman pose backstage as Barclaycard present British Summer Time Hyde Park at Hyde Park on July 6, 2018 in London, England. (Photo by Dave J Hogan/Dave J Hogan/Getty Images)
LONDON, ENGLAND - MAY 30: Lauren Silverman and Simon Cowell seen leaving Hammersmith Apollo after Britain's Got Talent - semi final day 3 on May 30, 2018 in London, England. (Photo by Ricky Vigil/GC Images)
LONDON, ENGLAND - JUNE 07: Simon Cowell and Lauren Silverman attend Together for Short Lives Midsummer Ball at Banqueting House on June 7, 2017 in London, England. (Photo by Ricky Vigil M/GC Images)
Simon Cowell and Lauren Silverman attending the Simon Cowell and The Dorchester treat children supported by Shooting Star Chase children's hospice to Afternoon Tea, London. (Photo by Ian West/PA Images via Getty Images)
Simon Cowell with Lauren Silverman and son Eric Cowell attending X Factor filming at Tobacco Dock, Wapping Lane, London. PRESS ASSOCIATION Photo. Picture date: Thursday July 6, 2017. Photo credit should read: Ian West/PA Wire (Photo by Ian West/PA Images via Getty Images)
HOLLYWOOD, CA - MARCH 22: Simon Cowell and Lauren Silverman attend a Star Ceremony on The Hollywood Walk Of Fame Honoring Haim Saban on March 22, 2017 in Hollywood, California. (Photo by Todd Williamson/Getty Images for Lionsgate)
LONDON, ENGLAND - NOVEMBER 17: Simon Cowell (R) with Lauren Silverman and son Eric Cowell attend a VIP Preview of Hyde Park's Winter Wonderland 2016 on November 17, 2016 in London, United Kingdom. (Photo by David M. Benett/Dave Benett/Getty Images)
LONDON, ENGLAND - JULY 18: Lauren Silverman and Simon Cowell leaving the Syco summer party at St James' Palace on July 18, 2016 in London, England. (Photo by Mark Robert Milan/GC Images)
LONDON, ENGLAND - OCTOBER 31: Simon Cowell and Lauren Silverman attend the Pride Of Britain Awards at The Grosvenor House Hotel on October 31, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - MAY 27: Simon Cowell (L) and Lauren Silverman attend afternoon tea for families supported by Shooting Star Chase Children's Hospice at The Dorchester on May 27, 2016 in London, England. (Photo by Dave J Hogan/Dave J Hogan/Getty Images)
LONDON, ENGLAND - NOVEMBER 19: Simon Cowell and Lauren Silverman attend the ITV Gala at London Palladium on November 19, 2015 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 19: Simon Cowell and Lauren Silverman attend the ITV Gala at London Palladium on November 19, 2015 in London, England. (Photo by Stuart C. Wilson/Getty Images)
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SEE ALSO: Simon Cowell makes rare appearance with girlfriend Lauren Silverman

"Within 24 hours I changed my diet and I’ve not looked back since. You feel better, you look better," he went on. "I cut out a lot of the stuff I shouldn’t have been eating and that was primarily meat, dairy, wheat, sugar -- those were the four main things."

"America's Got Talent" returns to NBC on Tuesday, May 28.

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