In the online entry, which has sparked fears for her emotional state, Allen dramatically claims to be considering gastric bypass surgery and liposuction.
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Lily Allen's fragile emotional state is a drastic change from her usually bolshy nature
It appears to be a worrying turn around: Allen, who is currently in the US, is known for championing her size 12 curves and criticising the size zero obsession.
Allen's entry reads: "I used to pride myself on being strong minded and not being some stupid girl obsessed with the way I look. I felt like it didn't matter if I was a bit chubby 'cause, I'm not a model, I'm a singer."
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Lily Allen says she can't compete with Amy Winehouse
It continues: "I'm afraid I am not strong and have fallen victim to the evil machine. I write to you in a sea of tears from my hotel bed in Seattle."
The outburst comes after her New Look collection Lily Loves received a lukewarm response from customers last week.
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Trouble: Lily Allen allegedly lashed out at a photographer during a night out
Allen is also reported to be under investigation by police for an alleged violent attack on a photographer in March.
Last month, Allen was starting to show signs of strain, cancelling 20 dates from her US tour.
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