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Model Gigi Hadid concerned everyone when she went from skinny person to very skinny person seemingly overnight this summer. The 21-year-old has always denied crash-diet and eating disorder rumors, and opened up to Elle Magazine about the real reason she shed the pounds so quickly.

Hadid disclosed that she suffers from Hashimoto's disease, an autoimmune disease that attacks the thyroid gland. Typically the symptoms of the disease include intolerance to cold, fatigue, depression and weight gain, but Hadid curbed side effects by taking medication. She cites a change in her metabolism as the reason for slimming down.

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My metabolism actually changed like crazy this year. I have Hashimoto's disease. It's a thyroid disease, and it's now been two years since taking the medication for it, so for the [Victoria's Secret Fashion Show] I didn't want to lose any more weight, I just want to have muscles in the right place, and if my butt can get a little perkier, then that's good.

@reebok @reebokwomen #PerfectNever #BeMoreHuman

A post shared by Gigi Hadid (@gigihadid) on

Gigi's frame came under fire when designer Tommy Hilfiger dressed her in an oversized poncho during for a 2015 fashion show. Hilfiger argued that Hadid was "curvaceous​" as far as models go, and wanted to cover her up because she was not "as tall and thin" as her fellow models. For the record, Gigi was totally cool with the poncho and holds no grudges again Hilfiger.

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Of course, Gigi maintains her physique with diet and exercise. She told Elle that she loves to box at the gym, but loathes doing squats. "They're painful, and you have to do so many for them to work," said the Victoria's Secret model. Relatable.