Demi Moore is allegedly being treated for an eating disorder.

The actress was rushed to hospital on Monday night after paramedics were called to her Los Angeles home. She was assessed for 30 minutes before being taken to a local medical facility after a reported seizure.

Reports have now emerged that Demi is being treated for anorexia, among other "substance abuse issues".

"She collapsed after having an epileptic seizure," a source told Radar Online about the emergency 911 call. "Demi is in getting treated for anorexia, as well as other issues that caused her seizure."

Demi was left devastated last year after reports emerged that her husband of six-years, Ashton Kutcher, had cheated on her on their sixth wedding anniversary. She announced soon after that she was ending the marriage but divorce papers have not yet been filed.

The 49-year-old star has been spotted looking increasingly frail since the breakdown of her marriage.

"She has not taken care of her health at all lately and has lost a ton of weight," the source added.

Less than two weeks before seeking treatment, Demi was spotted enjoying a night-out in Hollywood with 23-year-old daughter Rumer.

The star was supposedly seen in high spirits.

"When she first arrived, she kept to herself... but she started loosening up and getting into party mode," an onlooker told People.

"She seemed really happy to be out with her daughter's friends."