Pippa Middleton's pre-wedding diet is one you've most likely never heard of before.
According to E!, the 33 year old is a fan of the Sirtfood diet, which concentrates on 20 foods that help to speed up your metabolism and burn fat.
SEE ALSO: Pippa Middleton visits her wedding venue as the big day approaches
These foods include strawberries, kale, arugula, red wine, cocoa, walnuts, strawberries and coffee. They are high in polyphenols, which supposedly help activate a person's "skinny genes."
But don't be fooled, it gets a little wild.
RELATED: Pippa Middleton and her fianc, James Matthews
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Pippa Middleton and fiance
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BUCKLEBURY, BERKSHIRE - DECEMBER 25: Pippa Middleton and James Matthews attend church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Samir Hussein/Samir Hussein/WireImage)
KING'S LYNN, UNITED KINGDOM - JANUARY 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Pippa Middleton and James Matthews attend the Sunday service at St Mary Magdalene Church, Sandringham on January 8, 2017 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
Pippa Middleton (L), her fiance James Matthews (C) and her father Michael Middleton (back to camera) leave after attending the morning Christmas Day service at St Mark's Church in Englefield, near Bucklebury in southern England, Britain, December 25, 2016. REUTERS/Andrew Matthews/Pool
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The diet is broken down into two phases. Week one requires you to only consume 1,000 calories a day for the first three days, through three Sirtfood juices and one meal a day. Then, you consume 1,500 calories a day with two juices and two meals for the rest of week one.
Next follows a "maintenance" phase where you can eat three SirtFood meals and one juice a day.
Dietitian Brigitte Zeitlin told The Cut that the diet is actually quite dangerous, saying, "It's unhealthy and unsafe to eat below 1,200 calories a day."
She added that after a person gets off of the diet, they are probably going to gain the weight back again.
RELATED: Pippa's style transformation
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Pippa Middleton Style
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Pippa looked breezy in a lilac wrap dress while out in London.
Pippa attended a book launch in a pretty black dress with lce sleeves.
Pippa attended Sotheby's Summer Party in a bright summery dress.
Pippa wore this black and white belted dress to a book launch party.
Middleton looked beautiful in a beaded gown at a charity gala in London.
Pippa wore an Issa dress to the label's show at London Fashion Week.
The socialite attended theDay-Glo Midnight Roller Disco alongside her sister, Kate, wearing a sequined mini.
Pippa attended the End of Summer Ball in a flowing v-neck gown.
Pippa chose this bright blue frock for the 10th Anniversary celebration of Claridge's Bar.
Pippa wore this stunning white wrap dress to a polo match with white wedges.
Kate's younger sister wore a tiered yellow dress to Tatler's 300th Anniversary Party.
Pippa added a pop of red to her simple black dress with a bold belt.
Pippa attended a fundraiser in a metallic-embellished dress.
Pippa wore a black tiered jacket and bright pink fascinator to a friend's wedding.
The day before Kate's wedding, the family arrived together. Kate wore a patterned Issa dress while her sister was pretty in pink.
Pippa was dressed in an Alexander McQueen gown for her sister Kate Middleton's wedding to Prince William.
The morning after the Royal Wedding, the Middleton clan left their hotel. Pippa was spotted in bright white pants and a blue Zara blazer.
Pippa accessorized her all-denim look with a neutral bag.
The Duchess' younger sister stepped out carrying her favoriteModalu bag, wearing jeans and a bright pink top.
Pippa chose a blush colored Maje top and carried her Modalu bag while out in London.
Pippa wore a crocheted white dress and a jean jacket to theAEGON Championships.
Out for a shopping trip, Pippa chose a pretty blue and white wrap dress.
Middleton attended a Wimbledon match in a navy version of her crocheted sweater dress.
Pippa met up with friends wearing this casual denim dress by Whistles.
Pippa wore this pretty two-tone Zara dress while out in London.
Pippa dressed up aplaidMaje top with red flats and a Prada messenger bag.
Middleton wore Temperley London's classic fan dress during London Fashion Week.
Pippa stunned in London wearing a tiered silk dress by French Connection with a tan Whistles jacket.
Pippa got coffee with friends in a white Issa dress, adding a pop of color with her Prada bag and matching red flats.
Pippa glowed at the Boodles Boxing Ball in a red gown byTemperley.
The Duchess' younger sister looked pretty in plaid by Zara and black skinny jeans.
Pippa looked chic in a longsleeved LBD, an Alice by Temperley animal-print scarf and a Prada bag.
Pippa attended a charity event in a stunning floral gown byProject D.
Pippa wore a cobalt blue turtleneck dress with a chic black blazer and lace-up booties.
The socialite bundled up in a funnel-neck grey Fay coat and black boots.
We're slightly obsessed with Pippa's blueSara Berman coat with suede trim which she wore with a black dress and booties.
While out in London, Pippa wore a chic army green Faycoat with black skinny pants and a bag by Loewe.
The royal-in-law wore a snowy white coat with black boots and gloves.
Pippa went for a stroll in bright pink jeans by SuperDry, a plaidMaje top and Zara blazer.
Pippa wore a navy Orla Kiely jacketas she and brother James Middleton smile for the camera.
Pippa attended a Wimbledon match in anavy dress and macram jacket by Orla Kiely.
Pippa wore this and white Alice Temperleydress to the premiere of Shadow Dancer, completing the look with strappy heels.
Pippa wore a bright colorblocked Paper London dress to the U.S. Open.
Our favorite royal-in-law went out shopping in NYC carrying a Kate Spade bag, and wearing a casual but bright outfit.
Pippa attended the U.S. Open in a bright yellowPhase Eight frock.
Pippa wore Stella McCartney to promote her book Celebrate: AYear of Festivities for Families and Friends.
Pippa hosted a Halloween Party for children in London while promoting her book, wearing abrocade Markus Lupfer dress.
She attended a party for W&W Jewellery, a British jewelry company in a metallic skirt and neutral top.
Pippa traveled in style weraing a pretty eggplant coat.
Pippa promoted her book Celebrate in Amsterdam wearing a bright purple peplum dress by Beulah London.
Pippa looked cozy at the Cheltenham Festivalin aKatherine Hooker mustard yellow coat and the same Aquatalia boots her sister Kate loves.
As the new ambassador for the Mary Hare School for the Deaf, Pippa opened the "Murray House" in head-to-toe Tory Burch.
Kate's sister stepped out in London wearing a top and skirt by Sandro, jacket byAlice by Temperley, Alice + Olivia heels, and the Catherine Street Pippa bag by Kate Spade New York.
Pippa attended a party in a pink floral dress byTabitha Webb.
The middle-Middleton was out and about in silk ikat pants byAlice by Temperley.
Pippa out and about with boyfriend Nico in London, wearing a chic black dress.
Pippa wore a pretty green sweater dress and matching cardigan at the AEGON Championshipswith her mother Carole.
Attending a friend's wedding, Pippa looked lovely in a black and white peplumTabitha Webb dress andOlivia Roat Millinery fascinator.
Pippa looked chic in a powder blue blazer over a matching dress at Wimbledon.
Pippa attended Spectator Magazine's summer party in a pretty white lace dress.
Pippa went to another game at Wimbledon with boyfriend Nico, wearing a striped coral dress byTemperley London.
Leaving Andy Murray's match, Pippa looked vibrant in the coral dress.
Pippa attended the Queen's Coronation ceremony in afloral Tabitha Webb dress with a lace overlay, and carried a clutch byLamb 1887.
Pippa attends the wedding of James Meade and Lady Laura Marsham.
Pippa and Nico Jackson pose at the Boodles Boxing Ball 2013 on September 21, 2013 at the Grosvenor House in London,England.
Pippa attends a donors dinner hosted by Michael Bloomberg & Graydon Carter to celebrate the launch of the new Serpentine Sackler Gallery.
Pippa and James Middleton arrive at Chapel Royal in St James's Palace in central London to attend the christening of Prince George of Cambridge.
Pippa and boyfriend Nico Jackson attend the Sugarplum Ball.
Pippa attends a memorial service for Sir David Frost at Westminster Abbey.
Pippa attends day two of the Aegon Championships at Queens Club.
Pippa Middleton seen arriving at Wimbledon.
Pippa attends the GQ Men of the Year awards.
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