But this week the inspirational star has given her fans some encouraging news - she is finally managing to gain some weight.
Sharing a picture of her tucking into a bowl of potato and leek soup, the star wrote: ‘Finished! Time to move on to the ice cream. Gaining weight now but will probably end up with diabetes at the end of all this!!!’
Katie became worryingly thin after several throat operations left her with a torn oesophagus - making it impossible to eat normally.
The mum of one had been having the operations to remove scar tissue formed in the 2008 acid attack she was subjected to at the hands of her ex boyfriend and his accomplice.
But complications meant Katie was left in severe pain, vomiting and losing over a stone in just two weeks.
The super fit star is now looking to be finally on the mend, enjoying a healthy diet as part of her recovery.
On her Instagram account on Thursday, Katie revealed she has been asked to provide her medical records as part of a court case, sharing a picture of a massive mound of documents.