Zayn Malik opens up about possible eating disorder while in One Direction

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Zayn Malik has been open about his battle with anxiety, but the singer now says he was struggling with even more behind-the-scenes while in One Direction - a possible eating disorder.

Zayn made the revelation in his new self-titled autobiography, out on Tuesday via Penguin Random House, and also discussed it in an interview with The Associated Press.

"When I look back at the images of myself from around November 2014, before the final tour, I can see how ill I was," the 23-year-old writes in the book, calling it an "eating disorder".

One Direction
Zayn Malik (centre) with One Direction in 2014 (Abraham Caro Marin/AP)

In an interview with AP, Zayn explains that he was so busy on the road, he would forget to eat.

"I realised that I wasn't eating as much just down to the amount of work that we were doing... our schedule was kind of crazy so we were all over the place," he said.

"It was just more down to losing track of, you know, actually eating and being super busy and getting caught up with other things that 17 or 18-year-olds do, which normally entails them going out, drinking or partying, so it was a mixture of everything," he said.

Zayn Malik
Zayn Malik (Willy Sanjuan/AP)

However, he now downplays the seriousness of it all: "I don't think I ever had an eating disorder. I was never diagnosed with one of them."

Explaining that he would miss meals while in 1D, he said he is now better at managing his eating: "I'm a bit older and a bit more wiser."

In the book, his prologue is dedicated to 1D and the phenomenal success they achieved in a short time - selling out stadiums around the world, winning countless awards, launching back-to-back hits and platinum-plus albums.

"I'm massively grateful for the opportunity to be in that group," he said of the pop group, formed in 2010 on The X Factor. "It was a wicked part of my life."

One Direction
One Direction in 2010 (Katie Collins/PA)

Still, he bolted from the group because he felt lost and needed time to collect his thoughts. He yearned to sing songs in a different style and write his own lyrics.

"What you've got to understand is that none of us really had much say in the music," he writes.

When asked if he's still friends with his former band mates, he said: "Yeah we're talking - some of us are."

Of Niall Horan's solo single, he said he has heard it and that "it's cool".

Zayn's solo album, Mind Of Mine, veered into R&B territory. It debuted at number one, but Zayn wasn't prepared for solo stardom, even cancelling performances because he said he was too anxious.

In June, he bowed out of his performance at the Capital Summertime Ball at Wembley Arena, where he previously performed with 1D.

"I felt sick. I couldn't breathe," he writes about the morning of the show. "The idea totally freaked me out and I was paralysed with anxiety."

Zayn Malik and Gigi Hadid
Zayn Malik and Gigi Hadid (Evan Agostini/AP/PA Images)

Zayn said he is now able to cope with it, though he declined to offer any more specifics.

"I don't really disclose that information, like publicly, what I do to manage certain things, but I do the things that are required," he said.

While he details some of his difficulties in the book, don't expect a juicy tell-all: he rarely mentions former fiance and Little Mix member Perrie Edwards, and doesn't talk about current girlfriend Gigi Hadid.

Zayn Malik and Perrie Edwards
Zayn Malik and Perrie Edwards (Disneyland Paris/PA)

Still, there are some insights for Zayn fans: he writes that if he wasn't a singer, he would have probably gone to university to study English or worked as a songwriter and producer for other artists.

As he reflected on his time in 1D and leaving the group, then releasing his own album and number one hit Pillowtalk, Zayn said he's happy.

"I'm great actually at the moment," he said from a studio in Los Angeles, where he's recording his second solo album.

"The anxiety obviously came from just the performance aspect of things, just not really understanding what that was going to be like as a solo performer and just being apprehensive, as anybody is going into something new."

He also felt that being in 1D was a juggernaut he couldn't quite handle.

"That machine was already going, it was at 100 miles per hour and it was harder to get off that machine," he said. "I'm controlling this one."