The 21-year-old said she fights the metabolism slowing disease by incorporating boxing and spontaneous exercises in her routine, reported Elle.
"My metabolism actually changed like crazy this year. I have Hashimoto's disease. It's a thyroid disease," Hadid said.
"It's now been two years since taking the medication for it, so for the (Victoria's Secret) show I didn't want to lose any more weight," she said.
Zoe Saldana, Victoria Justice, Gina Rodriguez and Nia Vardalos also battle with the same autoimmune disease as Hadid.
Hadid, who just nabbed the British Fashion Council's Model of the Year Award, said she has put a note, saying 'squats' in her kitchen.