Eloise Parry wanted to be slimmer. To try to lose weight, she started taking diet pills, containing Dinitrophenol (DNP). It was a decision that would cost her life.
One night in April 2015, after taking eight pills, she became unwell and was admitted to Royal Shrewsbury Hospital. She died there alone.
Bernard Rebelo, 31, from Gosport in Hampshire, was found guilty of her manslaughter on June 27th 2018.
He was also convicted of placing unsafe food on the market.
He is due to be sentenced later today.
During the trial, Eloise's sister Rebecca Parry, now aged 19, said she had been "focused" on losing weight.
Rebecca said in the time leading up to her death, her sister had struggled "more and more" with her eating disorder.
She said Eloise had mental health difficulties as a teenager, and had been diagnosed with bulimia and a borderline personality disorder.
The trial heard that Eloise started taking DNP in pill form in February 2015.
She soon became addicted and dependent on the yellow powder in the capsules.
In the weeks before she died, Eloise was admitted to hospital on numerous occasions because of the side effects of DNP.
While she was in hospital for the the final time, Eloise wrote the following words.
I screwed up big time. Binged/purge all night and took another four pills at 4am when I woke.
Following her death, Eloise's family warned others about the dangers of DNP.
Speaking to ITV News Central in 2015, her mother Fiona said:
I want other people to know the risks.
Fiona Parry said her daughter did not realise DNP could kill her.
I honestly don't believe she knew it was that dangerous .