For seven long years, she battled her eating disorder.
Not only did she lose a lot of weight, she lost nearly all her friends and almost her life.
At her lowest, Miss Angeline Yap Siling weighed just 33kg and was, in her mother's words, a walking skeleton.
She mutilated herself and also tried to kill herself.
Only after the death of her friend, who also had anorexia nervosa, did Miss Yap finally decide to turn her life around.
Now weighing a healthy 47kg for her 1.64m frame, the 27-year-old is hoping to win the Miss World Singapore 2014 crown against 19 other finalists next Saturday.
She told The New Paper: "I wanted to join the pageant because I know I have the potential to win and I want to use this as a platform to reach out to young girls with eating disorders."
It started with her relatives jokingly asking if she was eating her sister's food.
Miss Yap, who has an identical twin sister, was always the bigger and taller of the pair growing up.
In Secondary 3, she started comparing her body with those of her sister and her schoolmates in her all-girls school.
"Looking at their bodies, I began to think that I was too fat, not pretty enough and not good enough," she said.
So the 15-year-old started starving herself.
She lost most of her friends in those seven years because she kept to herself and refused to go out with them to avoid having to eat.
She said her friends knew about her condition, but would not talk about it with her.
"I remember the only food I had during those years was whatever my mother gave me," Miss Yap said.
"Even so, if she gave me two slices of bread, I would throw away one and eat the other for the rest of the day. Some days, I would only drink water. "
By the time she was 18, her weight had plummeted to 33kg - just slightly above the allowance for check-in baggage on Singapore Airlines.
She said that living with anorexia had caused her body to "fail".
"Relationships in the family were strained and I was in a very dark and lonely place in my head."
Her dramatic weight loss led to frequent visits to doctors and psychiatrists.