Lady Gaga was admitted to hospital six times last year because of her extreme dieting, her former tour manager has claimed.
David Ciemny has said the 'sick' pop star used to binge on junk food and then go on crash diets.
"When I say she was sick, I mean physically and mentally," he is quoted in a new book as saying, the The Daily Mail reports.
In an extreme case, she once lost 9kg after not eating for weeks so that she could squeeze into a stage costume, reports The Daily Mail.
The claims have emerged in a new book called Poker Face: The Rise and Rise of Lady Gaga.
The star's health problems have continued to plague her this year, cancelling four US shows after collapsing and complaining of dizziness and breathing difficulties.
She also revealed in May that she had tested "borderline positive" for lupus, a disease related to the body's immune system.
The book, by Maureen Callahan, also explores Gaga's mental fragility.
Mr Ciemny said Gaga would sometimes share his marital bed for night-time cuddle with wife Angela.
"I would say, 'Gaga, I have a husband to go home to. I'll be in the room next door,'" Mrs Ciemny reportedly says in the book.
"She'd call and text me, 'I miss you Ange, can you come back?' So I would."
Mr Ciemny also claimed that Gaga sacked 150 staff members within 18 months, claiming that they were not up to scratch.
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