Demi Lovato Previews New Eating Disorder Documentary On 'Today' Show (VIDEO)

While most celebrities try to downplay their problems, Demi Lovato has made a comeback openly talking about hers.

On her "Today" show appearance this morning, the 19-year-old singer and actress performed "Give Your Heart a Break" and previewed "Demi Lovato: Stay Strong," her new documentary airing tonight on MTV, which follows the star in her ongoing treatment and recovery from eating disorders and other emotional issues.

"I've decided to tell my story because there are a lot of young teens, girls and boys, that are dealing with the same issues that I've been through," Lovato told the "Today" show's Ann Curry. "If I'm able to use my voice to do good in the world then I definitely want to do that."

Recovering from an eating disorder is a difficult task for anyone, and being in the public eye doesn't help. Lovato attributes her success in making it through to her supportive fans. "It means everything to me having that support ... it's ... I don't even have a word for it. It's amazing," she said. "The fans that I have are incredible."

Lovato will also make an appearance in MTV's Times Square studio in New York on Tuesday at 11 p.m. to take part in a live Q & A with fans. To join the conversation, Twitter users can submit questions to @MTVNews and @MTV with the hashtag #AskDemi.

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• 2011 Teen Choice Awards - Arrivals

  UNIVERSAL CITY, CA - AUGUST 07: Actresses/singers Demi Lovato and Selena Gomez arrive at the 2011 Teen Choice Awards held at the Gibson Amphitheatre on August 7, 2011 in Universal City, California. (Photo by Jason Merritt/Getty Images)

• Z100 & Coca-Cola All Access Lounge At 2011 Jingle Ball

  NEW YORK, NY - DECEMBER 09: Demi Lovato attends the 2011 Z100 & Coca-Cola All Access lounge at Z100's Jingle Ball 2011 pre-show at Hammerstein Ballroom on December 9, 2011 in New York City. (Photo by Slaven Vlasic/Getty Images)

• Z100's Jingle Ball 2011 Presented by Aeropostale - Show

  NEW YORK, NY - DECEMBER 09: Singer Demi Lovato performs onstage during Z100's Jingle Ball 2011, presented by Aeropostale at Madison Square Garden on December 9, 2011 in New York City. (Photo by Stephen Lovekin/Getty Images)

• The 12th Annual Latin GRAMMY Awards - Arrivals

  LAS VEGAS, NV - NOVEMBER 10: Singer/actress Demi Lovato arrives at the 12th annual Latin GRAMMY Awards at the Mandalay Bay Resort & Casino November 10, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

• The 12th Annual Latin GRAMMY Awards - Show

  LAS VEGAS, NV - NOVEMBER 10: Singers Demi Lovato and Pablo Alboran perform onstage during the 12th annual Latin GRAMMY Awards at the Mandalay Bay Events Center on November 10, 2011 in Las Vegas, Nevada. (Photo by Kevin Winter/Getty Images for Latin Recording Academy)

• 2011 World Series Game 5 - St Louis Cardinals v Texas Rangers

  ARLINGTON, TX - OCTOBER 24: Singer Demi Lovato walks on the field for the performance of the national anthem prior to Game Five of the MLB World Series between the St. Louis Cardinals and the Texas Rangers at Rangers Ballpark in Arlington on October 24, 2011 in Arlington, Texas. (Photo by Tom Pennington/Getty Images)

• Z100's Jingle Ball '11 Official Kick Off Party

  NEW YORK, NY - OCTOBER 21: Singer Demi Lovato performs on stage at Z100's Jingle Ball '11 official kick off party at Aeropostale Times Square on October 21, 2011 in New York City. (Photo by D Dipasupil/Getty Images)

• Demi Lovato Visits "Late Night With Jimmy Fallon"

  NEW YORK, NY - SEPTEMBER 20: Demi Lovato visits 'Late Night With Jimmy Fallon' at Rockefeller Center on September 20, 2011 in New York City. (Photo by Theo Wargo/Getty Images)

• 2011 MTV Video Music Awards - Red Carpet

  LOS ANGELES, CA - AUGUST 28: Singer Justin Bieber (L) and singer Demi Lovato arrive at the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)

• 2011 VH1 Do Something Awards - Blue Carpet

  HOLLYWOOD, CA - AUGUST 14: Actress/Musician Demi Lovato arrives at the 2011 VH1 Do Something Awards at the Hollywood Palladium on August 14, 2011 in Hollywood, California. (Photo by Christopher Polk/Getty Images for VH1)