Peaches Geldof claimed she slimmed down by cutting out junk food, following her doctor's warning about her unhealthy weight, before her death.
Geldof, 25, was found dead at her Kent country home Monday. The post-mortem examination, carried out by Darent Valley Hospital in Dartford on Tuesday, is still "inconclusive."
The mother of two sons - Astala, 23 months, and Phaedra, 11 months - ate McDonald's, pizza and chips every day and compared her heart to that of "a 90-year-old gangster," she told The Sun prior to her death.
Friends and family speculate that Geldof developed an eating disorder, citing her extremely thin figure (Geldof's mom, Paula Yates, who died from a heroin overdose in 2000, also suffered from an eating disorder).
With no suicide note or evidence of injury or drugs, television doctor Chris Steele notes that bulimic vomiting can create toxic levels of potassium in the body, which can cause heart irregularities or cardiac arrest.
"Without any evidence but just to my eye, Peaches' knuckles are darker than the rest of the finger and they are enlarged," Steele told Mail Online. "It is highly likely that it is from bulimia. That's not bulimia of a couple of weeks' duration, it is a long-term problem. I don't know any other condition that causes that in the knuckles," he concluded.
The former writer, presenter and model was presumed dead at her £1 million home in Wrotham after police received a worried phone call about her well-being.
Her funeral will likely be held at the Kent Church, where she married musician Tom Cohen in 2012. She is the second daughter of former Boomtown Rats singer Bob Geldof, 62.
Geldof, who was recently named a columnist for Mother and Baby Magazine, wrote in her last piece that she was "happier than ever" because of her "perfect life."
