John Goodman debuts dramatic weight loss at London premiere

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John Goodman Debuts Dramatic Weight Loss -- See the Pics!


John Goodman was looking good when he hit the red carpet on Thursday night.

The 63-year-old star appeared significantly slimmer as he posed with his Trumbo co-stars -- including Helen Mirren and Bryan Cranston -- at the BFI London Film Festival.

WATCH: Liam Neeson's Shocking Weight Loss Leaves Him Nearly Unrecognizable in NYC

Goodman looked half his size in his sharp, pinstripe navy suit that he paired with a polka-dot tie.


The acclaimed actor's weight has fluctuated over the years. In 2010, Goodman dropped 100 pounds and admitted on the Late Show With David Letterman that he once ballooned up to 400 pounds.

WATCH: Shonda Rhimes Reveals She Lost 98 Pounds This Year

"I'd get off of Roseanne every spring. I'd lose 60 pounds every spring," he said at the time. "Then I got too fond of the barleycorn. I'd gain it back and then some, every year. It's going to be an ongoing process for the rest of my life."

PHOTOS: John Goodman through the years

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John Goodman through the years
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John Goodman debuts dramatic weight loss at London premiere
017109.CA.1011.goodman4.CK. John Goodman is in a new sitcom called Normal, Ohio. Goodman is William 'Butch' Gamble, Jr. a rugged, confident, goodÂnatured, average guy in every way, except one. After coming out to his exÂwife and son and family, Butch moves in with his sister a tough, sexy, single mother of two teenage children. (Photo by Con Keyes/Los Angeles Times via Getty Images)
UNITED STATES - OCTOBER 13: ROSEANNE - 'Pretty in Black' - Season Five - 10/13/92, John Goodman (Dan) on the ABC Television Network comedy 'Roseanne'. Darlene's 16th birthday sees new neighbors and an embarrassing game of truth or dare for Roseanne., (Photo by ABC Photo Archives/ABC via Getty Images)
John Goodman during House of Blues Chicago Celebrates John Belushi's Birthday at House of Blues in Chicago, Illinois, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Actor John Goodman being photographed on February 8, 1998 at The St. Regis Hotel in New York City, New York. (Photo by Ron Galella/WireImage)
Actor John Goodman attending 46th Annual Golden Globe Awards on January 28, 1989 at the Beverly Hilton Hotel in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
SATURDAY NIGHT LIVE -- Episode 4 -- Air Date 11/03/2001 -- Pictured: John Goodman as Jon Maroney during the 'Little Sleuths' skit on November 3, 2001 (Photo by Mary Ellen Matthews/NBC/NBCU Photo Bank via Getty Images)
John Goodman during Monsters, Inc. Premiere at El Capitan Theatre in Hollywood, California, United States. (Photo by SGranitz/WireImage)
John Goodman during The 27th Annual People's Choice Awards at Pasadena Civic Auditorium in Pasadena, California, United States. (Photo by SGranitz/WireImage)
John Goodman looks on as the St. Louis Cardinals take batting practice prior to game three of the National League Division Series against the Los Angeles Dodgers at Dodger Stadium. (Photo by Steve Grayson/WireImage)
BEVERLY HILLS, CA - OCTOBER 21: Actor John Goodman speaks on stage during the 20th Annual American Cinematheque Award Dinner Honoring Al Pacino at the Beverly Hilton Hotel on October 21, 2005 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK - MAY 01: Actor John Goodman attends the 'Late Show With David Letterman' taping at the Ed Sullivan Theater May 01, 2008 in New York City. (Photo by Ray Tamarra/Getty Images)
UNITED STATES - JANUARY 16: ROSEANNE - 'Gallery' 1988 Roseanne Barr, John Goodman (Photo by ABC Photo Archives/ABC via Getty Images)
UNITED STATES - JANUARY 27: ROSEANNE - 'Inherit the Wind' 9/12/89 John Goodman (Photo by ABC Photo Archives/ABC via Getty Images)
(GERMANY OUT) Goodman, John - Actor, USA - at the International Berlin Film Festival Berlinale (Photo by Heerde/ullstein bild via Getty Images)
NEW YORK - MARCH 20: Actor John Goodman attends a photo call for the Broadway openings of 'Waiting For Godot' and 'The Philanthropist' at American Airlines Theatre, 5th Floor Penthouse Lobby on March 20, 2009 in New York City. (Photo by Stephen Lovekin/Getty Images)
UNITED STATES - MARCH 08: ROSEANNE - 'Gallery' 1989 John Goodman (Photo by ABC Photo Archives/ABC via Getty Images)
NEW YORK - JUNE 22: Actor John Goodman attends the launch of The Actors' Fund 'Responding To Essential And Evolving Needs' campaign at the Regency Hotel on June 22, 2009 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - MARCH 05: Actor John Goodman attends 'The Red State' tour launch at Radio City Music Hall on March 5, 2011 in New York City. (Photo by Mike Coppola/Getty Images)
TORONTO, ON - SEPTEMBER 08: Actor John Goodman of 'Argo' poses at the Guess Portrait Studio during 2012 Toronto International Film Festival on September 8, 2012 in Toronto, Canada. (Photo by Matt Carr/Getty Images)
LONDON, ENGLAND - OCTOBER 17: John Goodman attends the gala premiere of 'Argo' during the 56th BFI London Film Festival at The Odeon Leicester Square on October 17, 2012 in London, England. (Photo by Dave J Hogan/Getty Images)
BEVERLY HILLS, CA - OCTOBER 22: Actor John Goodman arrives at the 16th Annual Hollywood Film Awards Gala presented by The Los Angeles Times held at The Beverly Hilton Hotel on October 22, 2012 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - NOVEMBER 28: Actor John Goodman attends The Variety Studio: Awards Edition held at a private residence on November 28, 2012 in Los Angeles, California. (Photo by Jonathan Leibson/WireImage)
LOS ANGELES, CA - JANUARY 27: Actor John Goodman arrives at the19th Annual Screen Actors Guild Awards held at The Shrine Auditorium on January 27, 2013 in Los Angeles, California. (Photo by Jeff Vespa/WireImage)
CANNES, FRANCE - MAY 19: John Goodman attends 'Inside Llewyn Davis' Premiere during the 66th Annual Cannes Film Festival at Palais des Festivals on May 19, 2013 in Cannes, France. (Photo by Dave J Hogan/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 15: John Goodman attends the screening of 'Inside Llewyn Davis' Centrepiece Gala Supported By The Mayor Of London during the 57th BFI London Film Festival at Odeon Leicester Square on October 15, 2013 in London, England. (Photo by Stuart C. Wilson/Getty Images for BFI)
HOLLYWOOD, CA - NOVEMBER 14: John Goodman attends the AFI FEST 2013 presented by Audi closing night gala screening of 'Inside Llewyn Davis' at TCL Chinese Theatre on November 14, 2013 in Hollywood, California. (Photo by Frazer Harrison/Getty Images for AFI)
LONDON, ENGLAND - FEBRUARY 11: (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME. MANDATORY CREDIT PHOTO BY DAVE M. BENETT/WIREIMAGE REQUIRED) John Goodman attends the UK Premiere of 'The Monuments Men' at Odeon Leicester Square on February 11, 2014 in London, England. (Photo by Dave M. Benett/WireImage)
BEVERLY HILLS, CA - JULY 12: Actor John Goodman speaks onstage at the 'Alpha House' panel during the Amazon Prime Instant Video portion of the 2014 Summer Television Critics Association at The Beverly Hilton Hotel on July 12, 2014 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
TORONTO, ON - SEPTEMBER 12: John Goodman attends the 'Trumbo' premiere during the 2015 Toronto International Film Festival at The Elgin on September 12, 2015 in Toronto, Canada. (Photo by Walter McBride/FilmMagic)
LONDON, ENGLAND - OCTOBER 08: John Goodman attends the 'Trumbo' Accenture Gala during the BFI London Film Festival at Odeon Leicester Square on October 8, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - OCTOBER 08: John Goodman attends the 'Trumbo' Accenture Gala during the BFI London Film Festival at Odeon Leicester Square on October 8, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
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Matthew McConaughey's also had a major body transformation for his upcoming role in Gold. The Doctors' Dr. Travis Stork gave ET the rundown on the potential risks that come with celebrity yo-yo diets.

WATCH: Matthew McConaughey Is Bald, Pudgy and Nearly Unrecognizable on 'Gold' Set

"In general with that rapid weight loss, you can get malnutrition -- certainly if you're not getting enough protein," Dr. Stork said. "[It can] even put you at risk for gallstones, which certainly anyone who's had them knows that's no fun."

Celebrities' Crazy Yo-Yo Diet Transformations: Are They Safe?
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