Lady Gaga's career may be in the stratosphere but a new unauthorized biography reveals that her breathless journey to the top was not a smooth trajectory.
In "Poker Face: The Rise and Rise of Lady Gaga," which comes out September 14, author Maureen Callahan discloses that Lady Gaga -- one of the world's most image-conscious pop stars -- has weathered her share of weight, food and psychological issues.
"We haven't seen a character like this since Madonna and Prince, and Gaga has done [her career] so much faster and exploded in a bigger way," Callahan, a reporter at the New York Post, told ABCNews.com. The author opted to write the book independently, without her subject's involvement, so that she could freely approach whomever she wanted for information. She has never interviewed Lady Gaga.
It was Lady Gaga's uniqueness -- Callahan calls her "quick-witted, defiant and funny" and the fact that she has not made many career missteps -- that drew the author to her subject.
"The book shows Lady Gaga is more different than you ever thought," she said. "To me, she's one of the biggest contradictions, ever."
Callahan said Lady Gaga's poor eating habits seem to have begun when she signed with Rob Fusari, her first producer.
"It was made clear to her by her people that she needed to have a certain look," said Callahan.
One source mentioned that the artist often fumed while seeking a record deal because people weren't looking at her.
The game changer, said Callahan, was when Lady Gaga began doing photo shoots. A month before a key shoot, she dropped 20 pounds.
"All pop stars get this pressure put on them," says Callahan.
Callahan suggested that Lady Gaga, who's been touring for nearly two years, would not have been able to keep up the pace without proper nutrition. Then again, contradictions seem to be what Lady Gaga is all about.
The revelations in "Poker Face" are a cautionary tale for young artists obsessed with conceptualizing an image revered by media and fans, and aspiring to the iconic heights of fame, popularity and the paparazzi. What you see when eyeing a celebrity package isn't always what you get. And, according to "Poker Face," this seeming contradiction applies to Lady Gaga as well.
The book hits on several key areas that call into question how prepared Lady Gaga, born Stefani Joanne Germanotta, is to handle the ups and downs of fame. After all, she's only 24-years-old.
Below, five shocking revelations from "Poker Face:"
On Gaga's diet circa May 2009: She was suffering from lack of sleep, perpetual jet lag, and a rigorous, self-imposed diet. "She'd say, 'I can't have that, I can't have that,'" David Ciemny, Lady Gaga's former tour manager says. "She always wanted salads, deli meat and cheese, and hummus and chicken -- that was her big thing, hummus and grilled chicken. If she had something fried, she'd say, 'I totally splurged.'"
Like just about every other famous young girl, Lady Gaga had to keep her weight at a ridiculously low level. "From the first time we met her and measured her and checked her for the final [ensembles], she'd lost twenty pounts," says a costumer who worked with her last year. "She self-proclaimed that she didn't eat for weeks to fit into the clothes."