Rob Kardashian has lost about 30-50 pounds: 'His life is completely different now' (Exclusive)

Rob Kardashian has been making big strides in terms of both his health and his relationship with his famous family, a source tells ET. 

The 31-year-old reality star, who has largely remained out of the spotlight since his very public split from ex-fiancee Blac Chyna last July, has lost a significant amount of weight, our source says. Aside from the weight loss -- which the source estimates to be around 30-50 pounds -- the source notes that Rob has been working hard to get his life back on track, especially for the sake of his 1-year-old daughter, Dream.

“Getting out of the spotlight was so important for Rob,” the source says, noting that quitting Instagram has also been especially good for him. “He needed to completely change his life, things were spiraling out of control for him and his health and relationships were suffering. He needed to refocus.”

“His life is completely different now," the source adds.

According to the source, although Rob was in a dark place this time last year, his outlook has changed significantly thanks to mending his co-parenting relationship with Chyna, as well as getting his health under control by working with professionals and exercising and eating well. 

29 PHOTOS
Rob Kardashian
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Rob Kardashian and Khloe Kardashian (Kevork Djansezian/ Getty Images)
ORANGE, CA - JUNE 07: Lamar Odom and Khloe Kardashian make a personal appearance for 'Unbreakable Bond' at Perfumania on June 7, 2012 in Orange, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - APRIL 23: Lamar Odom, Khloe Kardashian and Rob Kardashian attend the grand opening of RYU on April 23, 2012 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - APRIL 23: Lamar Odom, Khloe Kardashian and Rob Kardashian attend the grand opening of RYU on April 23, 2012 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - APRIL 23: Kourtney Kardashian, Khloe Kardashian, Lamar Odom and Rob Kardashian are seen on April 23, 2012 in New York City. (Photo by Alo Ceballos/FilmMagic)
LOS ANGELES, CA - APRIL 05: Khloe Kardashian (R) and Rob Kardashian visit Extra at The Grove on April 5, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
LOS ANGELES, CA - APRIL 05: Khloe Kardashian (R) and Rob Kardashian visit Extra at The Grove on April 5, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
LOS ANGELES, CA - APRIL 05: Khloe Kardashian (R) and Rob Kardashian visit Extra at The Grove on April 5, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
Kim Kardashian, Floyd Mayweather, Khloe Kardashian and Rob Kardashian pose at Jet at The Mirage Hotel and Casino on March 18, 2011 in Las Vegas, Nevada.
LAS VEGAS, NV - MARCH 18: (L-R) Television personality Khloe Kardashian, Amercian boxer Floyd Mayweather Jr. and Rob Kardashian arrive to celebrate Rob's 24th birthday at the Jet Nightclub at The Mirage Hotel & Casino on March 18, 2011 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)
(L-R) Rob Kardashian, Kim Dsrdashian and Khloe Kardashian as NEW VEGAS Celebrates Kim Kardashian's 30th Birthday At TAO At The Venetian on October 15, 2010 in Las Vegas, Nevada.
LOS ANGELES, CA - FEBRUARY 18: (L-R) Khloe Kardashian Odom, Rob Kardashian and Lamar Odom celebrate at the 2011 BBVA NBA All-Star Celebrity Game at the Los Angeles Convention Center on February 18, 2011 in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Noel Vasquez/Getty Images)
LOS ANGELES, CA - MARCH 21: Rob Kardashian is seen on March 21, 2013 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
LAS VEGAS, NV - MAY 25: Rob Kardashian during his new Arthur George by Rob Kardashian sock collection unveiling at Neiman Marcus on May 25, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MAY 25: Rob Kardashian and Kris Jenner during the new Arthur George by Rob Kardashian sock collection unveiling at Neiman Marcus on May 25, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MAY 25: Rob Kardashian poses for photos with fans during his new Arthur George by Rob Kardashian sock collection unveiling at Neiman Marcus on May 25, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MARCH 15: Rob Kardashian and Kris Jenner arrive at Rob Kardashian's 26th birthday celebration at 1 OAK Nightclub at The Mirage Hotel & Casino on March 15, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
MIAMI BEACH, FL - DECEMBER 10: Rob Kardashian presents his Arthur George Socks Collection at Neiman Marcus Bal Harbour at Neiman Marcus on December 10, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
LAS VEGAS, NV - MARCH 16: Rob Kardashian and Kris Jenner during Rob Kardashian's Arthur George Street sock line launch at Kardashian Khaos at The Mirage Hotel & Casino on March 16, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MARCH 15: (EXCLUSIVE COVERAGE) Rob Kardashian (R) celebrates his 26th birthday with his mom Kris Jenner (R) at 1 OAK Nightclub at The Mirage Hotel & Casino on March 15, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
MIAMI BEACH, FL - DECEMBER 10: Rob Kardashian presents his Arthur George Socks Collection at Neiman Marcus Bal Harbour at Neiman Marcus on December 10, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
ATLANTIC CITY, NJ - SEPTEMBER 29: Brody Jenner (L) and Rob Kardashian host The Pool After Dark at Harrah's Resort on Saturday September 29, 2012 in Atlantic City, New Jersey. (Photo by Tom Briglia/FilmMagic)
PARIS, FRANCE - SEPTEMBER 19: Kris Jenner and Rob Kardashian are seen strolling on September 19, 2012 in Paris, France. (Photo by Marc Piasecki/FilmMagic)
MANILA, PHILIPPINES - OCTOBER 27: Rob Kardashian showcases designs by Human on the runway on day five of Philippine Fashion Week Spring/Summer 2013 on October 27, 2012 in Manila, Philippines. (Photo by Jeoffrey Maitem/Getty Images)
LOS ANGELES, CA - MARCH 08: Rob Kardashian is seen at LAX on March 08, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 14: Rob Kardashian and Blac Chyna are seen at LAX on March 14, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 25: Rob Kardashian and Blac Chyna are seen at LAX on March 25, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
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“He’s got his priorities in check," the source says. "First and foremost he is there for Dream and he knows that to do so he needs to be healthy."

The source adds that while there was a time when Rob barely left his home, he’s now been seen out a lot more and appears to be happy and in good spirits. According to the source, Rob has been spending a lot of time with his sisters -- Kim, Khloe and Kourtney Kardashian, as well as Kendall and Kylie Jenner -- and with their children. 

“All the cousins [Dream and Rob’s sister’s kids] are very close,” the source says. 

Earlier this month, Khloe hosted a "cousin cupcake party" for her daughter True's 6-month birthday, which included Dream. The priceless group photo also included Kylie's 8-month-old daughter, Stormi, and Kim's youngest kids, 2-year-old Saint and 9-month old Chicago.

Rob has also been open in the past about his struggles with his weight. In August 2016, he talked about missing Kim's lavish 2014 Italian wedding to Kanye West because of his insecurities. 

"I was doing my suit fittings in Paris right before the wedding and I just wasn't comfortable," he told People. "I'm 6'1" and at my most I probably weighed 300 lbs."

He also explained why he stopped filming Keeping Up With the Kardashians. 

"I just wasn't down to have photographers follow me, so I made sure I was away from all of that," he said. "I'm very good at disappearing."

In February, Khloe talked about Rob's weight struggles on her E! show, Revenge Body With Khloe Kardashian, while comforting a woman named Allison.

“I know how you feel,” Khloe said. “You feel trapped in your own body, and I feel that way for my brother, who has gained a lot of weight. It’s debilitating."

22 PHOTOS
Rob Kardashian and Blac Chyna together
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Rob Kardashian and Blac Chyna together
NEW YORK, NY - APRIL 14: Rob Kardashian and Blac Chyna are seen on April 14, 2016 in New York City. (Photo by XPX/Star Max/GC Images)
NEW YORK, NY - APRIL 14: Rob Kardashian and Blac Chyna are seen on April 14, 2016 in New York City. (Photo by XPX/Star Max/GC Images)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Rob Kardashian and Blac Chyna at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
LOS ANGELES, CA - APRIL 18: Rob Kardashian and Blac Chyna are seen at LAX on April 18, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 26: Kim Kardashian, Rob Kardashian, and Blac Chyna are seen on April 26, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 26: Kim Kardashian, Rob Kardashian, and Blac Chyna are seen on April 26, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 14: Rob Kardashian and Blac Chyna are seen at LAX Airport in Los Angeles, Ca on March 14, 2016 in Los Angeles, California. (Photo by Light Brigade/Bauer-Griffin/GC Images)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Rob Kardashian and Blac Chyna at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
LOS ANGELES, CA - MARCH 14: Rob Kardashian and Blac Chyna is seen at LAX on March 14, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
ROB & CHYNA -- Season:1 -- Pictured: (l-r) Rob Kardashian, Blac Chyna -- (Photo by: Tommy Garcia/E! Entertainment/NBCU Photo Bank via Getty Images)
LAS VEGAS, NV - MAY 28: Television personality Rob Kardashian (L) and model Blac Chyna attend the Sky Beach Club at the Tropicana Las Vegas on May 28, 2016 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
LAS VEGAS, NV - MAY 28: Model Blac Chyna (L) and television personality Rob Kardashian attend the Sky Beach Club at the Tropicana Las Vegas on May 28, 2016 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
LAS VEGAS, NV - MAY 28: Television personality Rob Kardashian (L) and model Blac Chyna attend the Sky Beach Club at the Tropicana Las Vegas on May 28, 2016 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
HOLLYWOOD, CA - MAY 10: Blac Chyna and Rob Kardashian attend Blac Chyna's birthday celebration and unveiling of her 'Chymoji' Emoji Collection at Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by JB Lacroix/WireImage)
HOLLYWOOD, CA - MAY 10: Blac Chyna and Rob Kardashian attend Blac Chyna's birthday celebration and unveiling of her 'Chymoji' Emoji Collection at Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by JB Lacroix/WireImage)
HOLLYWOOD, CA - MAY 10: Rob Kardashian and Blac Chyna arrive at her Blac Chyna Birthday Celebration And Unveiling Of Her 'Chymoji' Emoji Collection at the Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by Greg Doherty/Getty Images)
HOLLYWOOD, CA - MAY 10: Blac Chyna (L) and Rob Kardashian arrive for her Blac Chyna's birthday celebration and unveiling of her 'Chymoji' Emoji Collection at Hard Rock Cafe, Hollywood, CA on May 10, 2016 in Hollywood, California. (Photo by Gabriel Olsen/WireImage)
HOLLYWOOD, CA - MAY 10: Rob Kardashian and Blac Chyna arrive at her Blac Chyna Birthday Celebration And Unveiling Of Her 'Chymoji' Emoji Collection at the Hard Rock Cafe on May 10, 2016 in Hollywood, California. (Photo by Greg Doherty/Getty Images)
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