Thousands of young women with diabetes are skipping insulin injections in a bid to lose weight.
But experts are warning they are risking their health.
Insulin helps people with diabetes absorb glucose
Sarah was 21 when she was diagnosed with type 1 diabetes.
The news kick-started a seven-year battle with her weight.
"I was like any normal 21-year-old. I liked going out, travelling and drinking.
"But all of a sudden I was told I had this condition and I had to start controlling my diet and managing my diabetes."
After starting her daily injections of insulin, she found her weight started increasing - insulin helps patients to absorb glucose better.
From weighing about 9st before her diagnosis, she soon reached 12st.
Sarah, who is now 28 and lives in London, said: "It was hard. There is all this pressure on girls to remain thin, from magazines, from advertising.
"I supposed I just freaked out. I started missing some of my doses. I would just take one in the evening and miss all the others I should have been taking with my meals.
"The doctors and nurses were telling me what harm I was doing, but I would just not listen."
Sarah's behaviour has led to her being admitted to hospital three times in the last six years after infections - or on one occasion food poisoning - prompted her blood sugar levels to dangerously high levels.
"I would have a scare and then start having the injections, but I would soon relapse. It didn't matter, I just thought I had to lose weight."
At points her weight dropped to 6.5st, but Sarah's perspective changed last year when she found herself in hospital a few days before her 27th birthday in June.
"I suppose I just started thinking what I was doing. My eyesight had started to suffer and I had nerve damage at the bottom of my legs. The doctors said I would never be able to reverse the damage.
"I guess I just realised I could end up doing myself a lot of harm and that one-day it would go too far and I might die."
Sarah is now taking her four-daily insulin doses, but she says it is still a battle.
"The temptation is always there, in a way it is reassuring to know there are other women in my position. I just hope I can keep it under control now."