Demi Lovato struggled with body image months before apparent drug overdose, source says

Demi Lovato was putting "added pressure on herself" in the months leading up to her apparent drug overdose, a source tells ET.

The 25-year-old singer, who had been traveling as part of her Tell Me You Love Me tour, was concerned about "looking great" for her performances, according to the source, who adds that Lovato was "feeling self conscious" about her weight.

"Three weeks ago, a close friend of Demi's tried to sit down and talk to her. They were so worried," the source says of the singer's relapse after six years of sobriety. "They wanted to help her slow down and live a cleaner lifestyle, but all she cared about was her weight gain."

"She didn't want to talk about her drug or alcohol use, she wanted to discuss dieting. Demi started gaining weight in the last few months and her friends knew she was partying way too much and was in a terrible place," the source claims. "Demi is very self-conscious about her weight and she puts added pressure on herself to look great because she feels that it's what the public and her fans expect, but she wasn't willing to give up partying for weight loss."

40 PHOTOS
Demi Lovato, from past to present
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Demi Lovato, from past to present
LOS ANGELES, CA - NOVEMBER 23: Demi Lovato attends 2008 American Music Awards at Nokia Theatre on November 23, 2008 in Los Angeles, CA. (Photo by ANDREAS BRANCH/Patrick McMullan via Getty Images)
HOLLYWOOD - NOVEMBER 30: Recording artist Demi Lovato performs onstage at the 2008 Hollywood Holiday Winterfest on November 30, 2008 in Hollywood, California. (Photo by Valerie Macon/Getty Images)
WESTWOOD, CA - NOVEMBER 17: Demi Lovato arrives at the Los Angeles premiere of 'Twilight' at the Mann Village and Bruin Theaters on November 17, 2008 in Westwood, California. (Photo by Steve Granitz/WireImage)
Demi Lovato Arrives For The Disney Channel European Premiere Of Camp Rock At The Royal Festival Hall On The South Bank In Central London. (Photo by Justin Goff\UK Press via Getty Images)
UNIVERSAL CITY, CA - SEPTEMBER 14: Actress/singer Demi Lovato arrives at the City of Hope benefit concert at the Gibson Amphitheater on September 14, 2008 in Universal City, California. (Photo by Lester Cohen/WireImage)
NEILL J. SCHUTZER/�2008 RAMEY PHOTO NEW YORK 8/29/08 DEMI LOVATO LEAVING HER HOTEL IN NEW YORK NJSSR (Photo by Philip Ramey/Corbis via Getty Images)
NEW YORK - SEPTEMBER 03: Demi Lovato seen on the streets of Manhattan on September 3, 2008 in New York City. (Photo by James Devaney/WireImage)
Singer Demi Lovato arrives at the 2008 Teen Choice Awards at Gibson Amphitheater on August 3, 2008 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - NOVEMBER 22: Demi Lovato attends 2009 AMERICAN MUSIC AWARDS at NOKIA Theatre LA Live on November 22, 2009 in Los Angeles, California. (Photo by ANDREAS BRANCH/Patrick McMullan via Getty Images)
Singer Demi Lovato performs onstage during City of Hope's 2nd Annual Concert For Hope at Nokia Theatre L.A. Live on October 25, 2009 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
LOS ANGELES, CA - OCTOBER 25: Recording artist Demi Lovato arrives for Disney's 2nd Annual Concert For Hope at the Nokia Theatre on October 25, 2009 in Los Angeles, California. (Photo by Kristian Dowling/Getty Images)
Recording artist Demi Lovato spends an hour meeting fans and signing autographs at an AT&T store in Orlando, Florida, Sunday, August 2, 2009. (Photo by Nick Masuda/Orlando Sentinel/MCT via Getty Images)
LATE NIGHT WITH JIMMY FALLON -- Episode 883 -- Pictured: Demi Lovato during a skit on September 3, 2013 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - OCTOBER 12: Demi Lovato attends the 2010 American Music Awards nomination announcements held at JW Marriott - Los Angeles at L.A. LIVE on October 12, 2010 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
HOLLYWOOD, CA - SEPTEMBER 23: Demi Lovato arrives at Padres Contra El Cancer's 25th Anniversary Gala Honoring George Lopez & Enrique Alejo at The Hollywood Palladium on September 23, 2010 in Hollywood, CA. (Photo by Gregg DeGuire/FilmMagic)
- AUGUST 18: Demi Lovato attends Disney Channel Hosts 'Camp Rock 2: The Final Jam' at Alice Tully Hall at Lincoln Center on August 18, 2010 in New York City. (Photo by RICHARD KOEK/Patrick McMullan via Getty Images)
GOOD MORNING AMERICA - Celebrating the release of the movie musical 'Camp Rock 2: The Final Jam,' which premieres September 3rd on the Disney Channel, Demi Lovato and cast members rock Central Park as part of the GMA Summer Concert Series, on GOOD MORNING AMERICA, 8/13/10 airing on the ABC Television Network. GM10 (Photo by Ida Mae Astute/ABC via Getty Images) DEMI LOVATO
SUNRISE, FL - DECEMBER 10: Demi Lovato performs at the Y 100 Jingle Ball at BankAtlantic Center on December 10, 2011 in Sunrise, Florida. (Photo by Gustavo Caballero/WireImage)
LAS VEGAS, NV - NOVEMBER 10: Singer/actress Demi Lovato arrives at the 12th annual Latin GRAMMY Awards at the Mandalay Bay Resort & Casino on November 10, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LOS ANGELES, CA - OCTOBER 11: Demi Lovato is seen on October 11, 2011 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
LOS ANGELES, CA - OCTOBER 11: Demi Lovato visits Extra at The Grove on October 11, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
LOS ANGELES, CA - DECEMBER 20: Singer/tv personality Demi Lovato attends the season finale of Fox's 'The X Factor' at CBS Television City on December 20, 2012 in Los Angeles, California. (Photo by Barry King/FilmMagic)
LOS ANGELES, CA - DECEMBER 17: X Factor Judge Demi Lovato attends Fox's 'The X Factor' season finale news conference at CBS Television City on December 17, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - DECEMBER 16: Demi Lovato performs onstage at the 'VH1 Divas' show held at The Shrine Auditorium on December 16, 2012 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
SUNRISE, FL - DECEMBER 20: Demi Lovato participates in Y 100 Jingle Ball at BB&T Center on December 20, 2013 in Sunrise, Florida. (Photo by Aaron Davidson/WireImage)
BEVERLY HILLS, CA - DECEMBER 11: Singer Demi Lovato attends The Hollywood Reporter's 22nd annual Women In Entertainment Breakfast Honoring Oprah Winfrey at Beverly Hills Hotel on December 11, 2013 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
TAMPA, FL - DECEMBER 22: Demi Lovato performs onstage during 93.3 FLZ�s Jingle Ball 2014 at Amalie Arena on December 22, 2014 in Tampa, Florida. (Photo by Tim Boyles/Getty Images for iHeartMedia)
CHICAGO, IL - DECEMBER 18: Singer Demi Lovato attends 103.5 KISS FM's Jingle Ball on December 18, 2014 in Chicago, Illinois. (Photo by Gabriel Grams/FilmMagic)
WASHINGTON, DC - DECEMBER 15: Demi Lovato attends HOT 99.5�s Jingle Ball 2014, Presented by Mattress Warehouse at the Verizon Center on December 15, 2014 in Washington, D.C. (Photo by Larry French/Getty Images for iHeartMedia)
Demi Lovato performs during Dick Clark's New Year's Rockin' Eve at Times Square on December 31, 2015 in New York City.
TAMPA, FL - DECEMBER 19: Demi Lovato attends the 2015 93.3 FLZ Jingle Ball at Amalie Arena on December 19, 2015 in Tampa, Florida. (Photo by Taylor Hill/FilmMagic)
MIAMI, FL - DECEMBER 18: Demi Lovato attends the 2015 Y100 Jingle Ball at BB&T Center on December 18, 2015 in Sunrise, Florida. (Photo by Taylor Hill/FilmMagic)
NEW YORK, NY - DECEMBER 11: Singer-songwriter Demi Lovato attends Billboard's 10th Annual Women In Music at Cipriani 42nd Street on December 11, 2015 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
Recording artist Demi Lovato attends 2016 Glamour Women Of The Year Awards in Hollywood, California, on November 14, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
Singer Demi Lovato performs at the 2016 Global Citizen Festival in Central Park to end extreme poverty by 2030 at Central Park on September 24, 2016 in New York City. / AFP / ANGELA WEISS (Photo credit should read ANGELA WEISS/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 24: Singer Demi Lovato attends the 2016 Global Citizen Festival In Central Park To End Extreme Poverty By 2030 at Central Park on September 24, 2016 in New York City. (Photo by Noam Galai/Getty Images for Global Citizen)
MIAMI BEACH, FL - DECEMBER 31: Demi Lovato performs onstage at Fontainebleau Miami Beach on December 31, 2017 in Miami Beach, Florida. (Photo by Rodrigo Varela/Getty Images for Fontainebleau Miami Beach)
PASO ROBLES, CA - JULY 22: Demi Lovato performs during the 2018 California Mid-State Fair on July 22, 2018 in Paso Robles, California. (Photo by C Flanigan/Getty Images)
US singer Demi Lovato performs on stage during the Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon, on June 24, 2018. (Photo by MIGUEL RIOPA / AFP) (Photo credit should read MIGUEL RIOPA/AFP/Getty Images)
BILLBOARD MUSIC AWARDS -- Red Carpet Arrivals -- 2018 BBMA's at the MGM Grand, Las Vegas, Nevada -- Pictured: Demi Lovato -- (Photo by: Brian Friedman/NBC/NBCU Photo Bank via Getty Images)
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And according to our source, those closest to Lovato "saw this OD coming." An additional source told ET earlier this week that Lovato's family is already looking into rehab facilities in hopes of checking her in right away.

"Her family is going to do everything in their power to help get Demi back on track and are making plans to get her straight into rehab," the source said. "She is a fighter and has beat this in the past, so they know she can live a clean and sober life again. Her mother is by her side."

Lovato first entered rehab at the age of 18, completing her inpatient treatment for "emotional and physical issues" in January 2011. She later revealed in various interviews and in her documentary, Simply Complicated, that she struggled with bulimia and was self-medicating with drugs like cocaine and alcohol. 

Since her treatment, she's been very vocal about her past struggles with sobriety, substance abuse, self-harm and body image. Back in January, she revealed via Twitter that she had gained a little weight.

"Feeling gross today at a photo shoot but I'm choosing to accept what I see because I love myself for who I am and your love and support gets me through moments like this," she tweeted at the time. "If you're struggling as well, don’t forget.. if I can do it, you can too!"

"No longer depriving myself of treats (in moderation) and I'm not gonna lie, I put on a couple lbs since I've given up dieting," she continued. "BUT I've given up the chronic stress of what I eat because I don't want to set that example for my fans. No more food shaming myself!!"

17 PHOTOS
Demi Lovato with the Jonas Brothers through the years
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Demi Lovato with the Jonas Brothers through the years
Singers Joe Jonas and Demi Lovato perform on ABC's "Good Morning America" in New York August 13, 2010. REUTERS/Lucas Jackson (UNITED STATES - Tags: ENTERTAINMENT)
CAMP ROCK 2: THE FINAL JAM - Disney Channel's 'Camp Rock 2: The Final Jam' stars Joe Jonas as Shane and Demi Lovato as Mitchie. (Photo by Bob D'Amico/Disney Channel via Getty Images)
February 24, 2009 Hollywood, Ca.; Demi Lovato and Jonas Brothers; Jonas Brothers: The 3D Concert Experience - World Premiere; Held at El Capitan Theatre (Photo by Gregg DeGuire/FilmMagic)
Nick Jonas, Demi Lovato, Joe Jonas, Kevin Jonas attend(s) the 2010 Arthur Ashe Kids' Day at USTA Billie Jean King National Tennis Center on August 28, 2010 in New York City. (Photo by Shaun Mader/Patrick McMullan via Getty Images)
- AUGUST 18: (L-R) Nick Jonas, Demi Lovato, Joe Jonas and Kevin Jonas attend Disney Channel Hosts 'Camp Rock 2: The Final Jam' at Alice Tully Hall at Lincoln Center on August 18, 2010 in New York City. (Photo by RICHARD KOEK/Patrick McMullan via Getty Images)
Singers Joe Jonas and Demi Lovato (R) arrive at the 2011 MTV Video Music Awards in Los Angeles, August 28, 2011. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (MTV-ARRIVALS)
Singers Joe Jonas (L), Selena Gomez and Demi Lovato (R) arrive at the 2011 MTV Video Music Awards in Los Angeles, August 28, 2011. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (MTV-ARRIVALS)
NEW YORK - AUGUST 19: (EXCLUSIVE ACCESS - PREMIUM RATES APPLY) Joe Jonas, Demi Lovato and Nick Jonas attend Demi Lovato's 18th birthday party at Buddakan on August 19, 2010 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Full Picture)
UNIVERSAL CITY, CA - AUGUST 11: (L-R) Musicians Demi Lovato, Joe Jonas, and Nick Jonas attend the 2013 Teen Choice Awards at Gibson Amphitheatre on August 11, 2013 in Universal City, California. (Photo by Kevin Mazur/Fox/WireImage)
LOS ANGELES, CA - DECEMBER 05: Recording artists Nick Jonas (L) and Demi Lovato perform onstage during KIIS FM's Jingle Ball 2014 powered by LINE at Staples Center on December 5, 2014 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
INGLEWOOD, CA - AUGUST 24: (L-R) Singer Demi Lovato, Olivia Culpo and singer Nick Jonas attend the 2014 MTV Video Music Awards at The Forum on August 24, 2014 in Inglewood, California. (Photo by Christopher Polk/MTV1415/Getty Images for MTV)
WEST HOLLYWOOD, CA - NOVEMBER 22: Wilmer Valderrama, Demi Lovato and Joe Jonas attend the Moet & Chandon AMA After Party with Jennifer Lopez at HYDE Sunset: Kitchen + Cocktails on November 22, 2015 in West Hollywood, California. (Photo by Michael Kovac/Getty Images for Moet & Chandon)
GOOD MORNING AMERICA - Nick Jonas and Demi Lovato are guests on 'Good Morning America,' 10/26/15, airing on the ABC Television Network. (Photo by Lou Rocco/ABC via Getty Images)
HOLLYWOOD, CA - SEPTEMBER 17: Nick Jonas and Demi Lovato hand out sweet treats and tickets to Demi Lovato's sold out show for Marriott Rewards Members in Los Angeles next week at TCL Chinese Theatre on September 17, 2016 in Hollywood, California. (Photo by Jesse Grant/Getty Images for Universal Music Group)
LOS ANGELES, CA - NOVEMBER 19: Demi Lovato and Nick Jonas at the 2017 American Music Awards at Microsoft Theater on November 19, 2017 in Los Angeles, California. (Photo by Jeff Kravitz/AMA2017/FilmMagic for dcp)
LOS ANGELES, CA - FEBRUARY 14: Singers Nick Jonas (L) and Demi Lovato during 'Stayin' Alive: A GRAMMY Salute To The Music Of The Bee Gees' on February 14, 2017 in Los Angeles, California. (Photo by Lester Cohen/WireImage)
BEVERLY HILLS, CA - FEBRUARY 26: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) Recording artists Joe Jonas, Demi Lovato and Nick Jonas attend the 2017 Vanity Fair Oscar Party hosted by Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 26, 2017 in Beverly Hills, California. (Photo by Kevin Mazur/VF17/WireImage)
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As ET previously reported, a source told ET on Tuesday that Lovato was stable, and "awake and responsive" following her hospitalization. Her rep also released the following statement:

"Demi is awake and with her family, who want to express thanks to everyone for the love, prayers and support. Some of the information being reported is incorrect and they respectfully ask for privacy and not speculation as her health and recovery is the most important thing right now."

If you or someone you know is struggling with substance abuse, contact the Substance Abuse and Mental Health Services Administration (SAMHSA) National Helpline at 1-800-662-HELP (4357).

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