Irish actress Evanna Lynch, best known for starring as Luna Lovegood in the Harry Potter movies, spoke about the reason behind writing her new memoir, saying she wanted to honour "the difficulty and complexity" in her journey.

In 2006, the Louth star famously landed the part of her favourite character in the Harry Potter book series at the age of 14.

During an appearance on RTÉ's Today the actress, who struggled with an eating disorder in the past, agreed with presenters Dáithí Ó Sé and Emer O'Neill that her new memoir, The Opposite of Butterfly Hunting, is "no fairytale".

"No it's not, that's kind of the point," she said. "My story has been reduced to a fairytale in many ways and it's hard to communicate the complexity of these issues, that's why it's a very big book, to add some nuance and depth to this conversation.

"I love fairytales, I love a happy story too, but it was to honour the difficulty and complexity in the journey and to show the realities. When we are too much focused on the positive, people don't feel represented, they don't feel seen."

(L-R) Evanna Lynch, Rupert Grint, Emma Watson, Daniel Radcliffe and Katie Leung in 2007

She continued: "People like to learn about your vulnerabilities and your struggles because they can relate and connect and figure out a way through their own.

"The message is about putting your energy and focus into your dreams over your self-destruction. To me, creativity was a way out of those problems, it gave me a vision for a life beyond that very dark time."

Lynch said of writing about her eating disorder: "I wanted to write a book about that journey towards self-love, self-acceptance. I think you have to be honest about the ugly parts, the self hate.

"I wanted to write a book about eating disorders and recovery, that wasn't triggering, that wasn't focusing on the physical symptoms, to discuss the depths of what was going on, to not get distracted by the shocking details, all the stuff you see on the surface."

Evanna Lynch says the message of her memoir is about focusing on "your dreams over your self-destruction"

The Termonfeckin-born star also shared her experience of being cast in the Harry Potter franchise at such a young age.

"It was overwhelming, I was such a big fan of the books and the movies, I knew the scale of the thing. It took a while to feel like I belonged there because it was all so intimidating," she said.

Having dipped her toes into the world of writing books with her new memoir, she is keen to write more.

"Writing is the next thing, I really want to do more of that because I love books," Lynch said.

"I feel quite comfortable expressing myself in writing. I don't feel I'm as good expressing myself in speech or even in acting, so more books really, that's the plan."

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