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NEW YORK, NY - SEPTEMBER 07: Zayn Malik attends the Tom Ford September 2016 New York Fashion Week show on September 7, 2016 in New York City. (Photo by Brian Killian/WireImage)
Credit: Brian Killian/WireImage

Zayn Malik has nothing to hide and he's sharing his secrets in his new memoir, aptly titled Zayn. Among them are details about the singer's harrowing last few months as a member of One Direction, during which he battled anxiety and unhealthy eating habits.

"Something I've never talked about in public before, but which I have come to terms with since leaving the band, is that I was suffering from an eating disorder," Malik reportedly writes in the book. "When I look back at images of myself from around November 2014, before the final tour, I can see how ill I was."

Apparently, the problem was less about managing his weight and more about a lack of eating. "I'd just go for days—sometimes two or three days straight—without eating anything at all," Malik discloses in the memoir. "It got quite serious, although at the time I didn't recognize it for what it was."

In an interview with the Associated Press, the "Pillowtalk" singer further explained his struggles. "I realized that I wasn't eating as much just down to the amount of work that we were doing," he said. "Our schedule was kind of crazy so we were all over the place. 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 went on to state that he had never been formally diagnosed with an eating disorder.

The "Pillowtalk" singer also addressed his forthcoming book on Instagram—no caption was needed for the revelatory text post that ended with Malik heralding his good health and gratitude.

Zayn ($17; amazon.com) is out today.