Prince William acknowledges Princess Diana's struggle with bulimia for the first time

Prince William has opened up about his mother Princess Diana's struggles with bulimia for the first time.

In a new documentary from British broadcaster Channel Four, "Wasting Away: The Truth About Anorexia," the royal talks about the importance about speaking openly about eating disorders and other mental health issues. In recent years, William, along with his brother Prince Harry, have continued their late mother's efforts to de-stigmatize mental health issues.

The royal praised Mark Austin, a former anchor for a British news network, and his daughter Maddie, who is battling anorexia, for getting real about her struggles.

"We need to normalize the conversation about mental health. The fact that you are speaking out is incredibly brave," he said.

23 PHOTOS
Princess Diana with her sons
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Princess Diana with her sons
VENICE, ITALY - MAY 5: (FILE PHOTO) (L-R) Diana the Princess of Wales holds her son Harry, whilst looking at Prince William held by his father Prince Charles on May 5, 1985 in Venice, Italy. Prince William will celebrate his 21st birthday on June 21, 2003. (Photo by Georges de Keerle/Getty Images)
Princes William and Harry with their mother, Diana, Princess of Wales (1961 - 1997) in the garden of Highgrove House in Gloucestershire, 18th July 1986. William is wearing a Dallas Cowboys t-shirt.(Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana At Highgrove With Prince William And Prince Harry Dressed In Miniature Parachute Regiment Uniforms And Playing On Their Slide In The Garden (Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana With Her Sons Prince William And Prince Harry Playing With A Playhouse In The Garden Of Their Home Highgrove (Photo by Tim Graham/Getty Images)
The Prince and Princess of Wales on holiday with their children, Princes William and Harry, at the Spanish royal residence Marivent Palace, August 1987. (Photo by Terry Fincher/Getty Images)
The Princess of Wales arriving at Aberdeen airport with her sons William and Harry for a holiday at Balmoral Castle, August 1986. Princess Diana is wearing a polo motive sweater by Mondi. (Photo by Jayne Fincher/Getty Images)
UNITED KINGDOM - DECEMBER 01: Prince Charles, Prince of Wales and Diana, Princess of Wales at home in Kensington Palace with their sons Prince William and Prince Harry (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 16: Princess Diana And Prince William Leaving After Delivering Prince Harry To Mrs. Mynor's Nursery School. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JUNE 11: Diana, Princess Of Wales, Holding A Young Prince Harry In Her Arms As She Watches Trooping The Colour With Prince William And Princess Margaret From The Balcony Of Buckingham Palace. (Photo by Tim Graham/Getty Images)
BALMORAL, SCOTLAND - AUGUST 18: Diana, Princess of Wales, and Prince Harry play on the banks of the River Dee, near Balmoral Castle.during a Summer vacation, on August 18, 1987, in Balmoral, Scotland. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, with Prince Harry ( centre ), and her Niece's and Nephew's on holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
BATH - MAY 30: (FILE PHOTO) Prince William, Diana, Princess of Wales, Prince Harry and Charles, Prince of Wales, attend the wedding of the Duke of Hussey's daughter in May, 1989 in Bath, England. (Photo by Anwar Hussein/Getty Images)
LONDON - SEPTEMBER 12: (FILE PHOTO) Princess Diana with her sons Prince William and Prince Harry at Wetherby School on September 12, 1989 in London, England. It is Prince Harry's first day at school. (Photo by Anwar Hussein/Getty Images)
Diana, The Princess Of Wales Takes Her Sons, Prince'S William, And Harry Out On The Boat ' Maid Of The Mist ' To View Niagara Falls. (Photo by Julian Parker/UK Press via Getty Images)
CHERTSEY, UNITED KINGDOM - APRIL 18: Diana, Princess of Wales, with Prince Harry, on the Depth Charge ride at Thorpe Park, Theme Park, on April 18, 1992 in Chertsey United Kingdom . (Photo by Julian Parker/UK Press via Getty Images)
LECH, AUSTRIA - APRIL 10: Princess Diana With Princes William & Harry Skiing In Lech, Austria (Photo by Tim Graham/Getty Images)
Diana Princess Of Wales, Prince William & Prince Harry Visit The 'Thorpe Park' Amusement Park. (Photo by Julian Parker/UK Press via Getty Images)
AUSTRIA - MARCH 30: Lech: Princess Diana, sons William and Harry going to restaurant in calash In Lech, Austria On March 30, 1993. (Photo by Laurent SOLA/Gamma-Rapho via Getty Images)
LECH, AUSTRIA - MARCH 27: Princess Diana With Prince William & Prince Harry In Sleigh During Ski Holiday In Lech, Austria. Behind Are Diana's Friends Kate Menzies And Catherine Soames (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - AUGUST 19: Princess Diana, Prince Harry [ Waving ] And Prince William Watching The Parade Of Veterans On V J Day, The Mall, London. Designer Of Diana's Suit - Tomasz Starzewski (please Check - People Magazine, 04/12/1999) (Photo by Tim Graham/Getty Images)
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess holding Prince William whilst pregnant with Prince Harry, and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess and Prince Harry on holiday and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
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When asked by Austin whether he's proud of his mother for speaking out about her struggles, William said, "Absolutely. These are illnesses. Mental health needs to be taken as seriously as physical health."

If you recall, Diana revealed in a bombshell 1995 interview with BBC's Martin Bashir how her dramatic marriage to and divorce from Prince Charles had affected her self-confidence and mental health.

"I didn't like myself, I was ashamed because I couldn't cope with the pressures. I had bulimia for a number of years, and that's like a secret disease ... It's a repetitive pattern which is very destructive to yourself."

She continued: "It was a symptom of what was going on in my marriage. I was crying out for help, but giving the wrong signals, and people were using my bulimia as a coat on a hanger: They decided that was the problem -- Diana was unstable."

31 PHOTOS
Princess Diana and Prince Charles together
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Princess Diana and Prince Charles together
BALMORAL, UNITED KINGDOM - MAY 06: Prince Charles With His Fiance Lady Diana Spencer During A Photocall Before Their Wedding While Staying At Craigowan Lodge On The Balmoral Estate (exact Day Date Not Certain) (Photo by Tim Graham/Getty Images)
BALMORAL - AUGUST 19: Prince Charles, Prince of Wales and Princess Diana, Princess of Wales, wearing a suit designed by Bill Pashley, pose for a photo on the banks of the river Dee in the grounds of Balmoral Castle during their honeymoon on August 19, 1981 in Balmoral, Scotland. (Photo by Anwar Hussein/Getty Images)
UNITED KINGDOM - JULY 29: On July 29, 1981, Lady Diana SPENCER (aged 19) married Prince CHARLES (aged 32) at Buckingham Palace. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles And Princess Diana On The Balcony Of Buckingham Palace On Their Wedding Day. The Princess Is Wearing A Wedding Dress Designed By David And Elizabeth Emanuel. The Prince Is Wearing Naval Dress Uniform. (Photo by Tim Graham/Getty Images)
LONDRES, ROYAUME-UNI - 10 MARS: Lady Diana et le Prince Charles discutant avec la Princesse Grace de Monaco au Goldsmith's Hall, le 10 mars 1981 a Londres, Royaume-Uni. (Photo by Keystone-France\Gamma-Rapho via Getty Images)
(Original Caption) Queen Elizabeth joins the Prince and Princess of Wales on a Buckingham Palace balcony following their London wedding. (Photo by � Wally McNamee/CORBIS/Corbis via Getty Images)
The Prince and Princess of Wales arrive back at RAF Lossiemouth in Scotland after their honeymoon, September 1981. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
The Prince and Princess of Wales at the Braemar Highland Games in Scotland, September 1981. She wears a tartan suit by Caroline Charles and a tam o'shanter hat. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
Prince Charles Prince Charles and the Princess of Wales (1961 - 1997, later Diana, Princess of Wales) at Caernarvon Castle during an official tour of Wales, 27th October 1981. (Photo by Hulton Archive/Getty Images)
UNITED KINGDOM - JUNE 22: Prince Charles, Prince of Wales and Diana, Princess of Wales leave St Mary's Hospital in Paddington with their baby son, Prince William (Photo by Tim Graham/Getty Images)
Prince Charles and Princess Diana at Uluru, Northern Territory on 21 March 1983. . (Photo by Gerrit Fokkema/The Sydney Morning Herald/Fairfax Media via Getty Images)
UNITED KINGDOM - SEPTEMBER 04: The Prince And Princess Of Wales With The Queen Attending The Braemar Games In Scotalnd (Photo by Tim Graham/Getty Images)
(Original Caption) Melbourne, Australia: Princess Diana and the Prince of Wales share a joke with Australian comedian Paul Hogan at a gala performance in Melbourne, April 14th.
Princess Diana (1961 - 1997) and Prince Charles arrive for a state reception in Hobart, Tasmania, 30th March 1983. The princess is wearing the Spencer family tiara and a dress by Bruce Oldfield. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
SYDNEY, AUSTRALIA - MARCH 28: The Prince And Princess Of Wales Attending A Charity Ball In Sydney During A Trip To Australia (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles leaving St Mary's Hospital, London with their new-born son Prince Harry, September 1984. The Princess is wearing a red coat by Jan van Velden. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles at an Italian naval base at La Spezia, 20th April 1985. Charles is wearing a naval Commander's uniform, while Diana is wearing a white coat dress by Catherine Walker. (Photo by Princess Diana Archive/Getty Images)
The Prince and Princess of Wales visit a church in Florence during their tour of Italy, April 1985. The Princess is wearing a suit by Jasper Conran. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
VATICAN - APRIL: Diana Princess of Wales with Prince Charles have an audience with Pope John Paul II in the Vatican, Rome, Italy in April 1985 during the Royal Tour of Italy.Diana wore a black lace dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles on a skiing holiday in Malbun, Liechtenstein, January 1985. The princess is wearing a Head ski suit. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
WINDSOR - JUNE 29: Princess Diana, Princess of Wales kisses Prince Charles, Prince of Wales as she presents him with an award following a charity polo match at Windsor Great Park on June 29, 1985 in Windsor, England. (Photo by Anwar Hussein/Getty Images)
WASHINGTON - NOVEMBER 9, 1985: (FILE PHOTO) In this file photo issued October 31, 2005, Prince Charles, the Prince of Wales and Princess Diana, the Princess of Wales meet President Ronald Reagan and First Lady Mrs Nancy Reagan at the White House on November 9, 1985 during an official visit to America in Washington DC, USA. Prince Charles, the Prince of Wales is taking his new wife Camilla the Duchess of Cornwall on a visit to the United States which begins formally on November 1, 2005 (Photo by Tim Graham/Getty Images)
VANCOUVER, CANADA - MAY 03: The Prince And Princess Of Wales During A Visit To Vancouver, Canada. She Is Wearing A Suit Designed By Fashion Designer Bruce Oldfield (Photo by Tim Graham/Getty Images)
LONDON - AUGUST 4: Prince Edward, Viscount Linley, Prince Charles, Diana, Princess of Wales and the Queen at the Queen Mothers 87th birthday celebration on August 4, 1987 at Clarence House in London, England. Diana wore a dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)
WINDSOR, UNITED KINGDOM - JUNE 26: The Princess Of Wales Presents A Medal To Her Husband, Prince Charles, After A Polo Match At Windsor (Photo by Tim Graham/Getty Images)
AUSTRALIA - JANUARY 30: Diana, Princess of Wales and Prince Charles, Prince of Wales at the Central Coast Surf Carnival at Terrigal Beach, Sydney, Australia (Photo by Tim Graham/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - MARCH 15: The Prince And Princess Of Wales attend a desert picnic on March 15, 1989 in Adu Dhab, United Arab Emirates. (Photo by Georges De Keerle/Getty Images)
DUBAI, UNITED ARAB EMIRATES - MARCH 16: The Prince And Princess Of Wales On A Walkabout In Dubai On The Gulf Tour. Diana's Outfit Is By Fashion Designer Catherine Walker And Hat By Milliner Philip Somerville. (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997), wearing a Belville Sassoon dress, presenting Prince Charles with a trophy after competing at the Hola Cup polo match at the Guards Polo Club, Windsor, 29th June 1988. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
PARIS - NOVEMBER: Prince Charles and Diana Princess of Wales meet guests arriving at a dinner in the Elysee Palace in Paris, France in November 1988, during the Royal Tour of France. Diana wore a dress designed by Victor Edelstein. (Photo by David Levenson/Getty Images)
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In the months and weeks leading up to Princess Di's 20th death anniversary, William and Harry have been opening up about their late mother. Most recently, Harry was featured on Telegraph's Mad World podcast, where he revealed his own struggles with depression following Diana's death:

"I can safely say that losing my mum at the age of 12, and therefore shutting down all of my emotions for the last 20 years, has had a quite serious effect on not only my personal life but my work as well," he said. "I have probably been very close to a complete breakdown on numerous occasions when all sorts of grief and sort of lies and misconceptions and everything are coming to you from every angle."

William and Harry's effort to open up about Diana's death is completely unprecedented, as members of the royal family have historically kept their personal lives out of the public eye. However, since starting their mental health charity Heads Together in 2016, the royal brothers have made the conscious decision to open up about their own personal struggles in order to tackle the stigma, raise awareness and provide help for people with mental health challenges.

For more on Princess Diana's 20th death anniversary, watch the video above.

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