Her sister, Bella, and mother both suffer from Lyme Disease

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It’s no secret that prior to the infamous Victoria’s Secret show, models tend to up the ante when it comes to their fitness and diet in order to look as toned as possible for the runway.

However, some became concerned for Gigi Hadid, as it had appeared that the supermodel, known for being a little more curvaceous than the standard, had lost a lot of weight, making her figure slimmer than ever.

Now, Gigi has spoken out about the rumours and has revealed that she is suffering from a form of thyroid disease, which has contributed to her slimmer figure.

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Gigi, 21, addressed her changing body in a recent interview, and explained that she’d been diagnosed with Hashimoto’s disease, a condition that affects the thyroid.

Speaking to Elle magazine, Gigi – who is in a relationship with Zayn Malik – opened up about getting treatment for hypothyroidism, a condition that affects the metabolism, for the past two years. It causes it to slow down, which can cause weight gain and depression – and according to the model, the medications she takes to manage the disease is the cause for her newly skinny figure, despite her intentions not to lose weight.

‘My metabolism actually changed like crazy this year,’ she said. ‘So for the VS show I didn’t want to lose any more weight.’

Gigi takes NYC on 7th December 2016 (Zelig Shaul/ACE Pictures/REX/Shutterstock)

Gigi takes NYC on 7th December 2016 (Zelig Shaul/ACE Pictures/REX/Shutterstock)

News of her health battle comes after her sister, fellow catwalker Bella Hadid, her mother Yolanda Hadid of Real Housewives fame and brother Anwar have publicly dealt with having Lyme Disease.

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But despite her illness, the model works hard to not let it affect her work. ‘You know, I’ve never taken a sick day.

‘I feel that pressure of not taking time for yourself because you don’t want it to affect your professionalism,’ she added.