The aspiring actress, now 21, developed anorexia aged 16 which left her so thin she was unable to even sit on a chair without it being painful. She was later admitted to rehab in 2017.
She spoke out about her illness for the first time with The Sun on Sunday, saying 'Anorexia makes you really good at gaslighting people, making it sound like they're insane. My parents would say, 'Gaia, we heard you working out at 3am.' And I'd say, 'No you didn't, it was just the house moving. I was asleep.''
Gaia spoke of how Greg, 55, Emma, 62, her family, including brother Tindy, 35, and best friend gathered together for an intervention, with Gaia agreeing to a three-month rehab stint after Greg said: 'I don't know where my child is any more.'
Suffering: Greg Wise and Emma Thompson's daughter Gaia has detailed her three-year battle with anorexia - and credited her parents for saving her life by staging an emergency intervention (pictured in April right and during her anorexia battle left)
Adding that it was a 'kick in the teeth' she added: 'I had to listen to the people I loved most in the world who, at the time, I'd really forgotten about, tell me what I was doing.'
She said: 'That's when I said I'd go to rehab. I went on December 29, 2017, and stayed for three months. Since then I've had a lot of therapy — and I'll always be grateful for that, because it saved my life.'
Anorexia is a serious mental illness where a person restricts their food intake, which often causes them to be severely underweight. Many also exercise excessively.
Some sufferers may experience periods of bingeing, followed by purging. Sufferers often have a distorted view of themselves and think they are larger than they really are.
Support: The aspiring actress suffered with anorexia which left her so thin she was unable to even sit on a chair, before her parents staged an intervention and sent her to rehab (pictured last month with her parents)
Gaia believes the anorexia was brought on when her aunt Clare, Greg's sister, was diagnosed with breast cancer and then later moved in with their family.
She said: 'I wanted to not be a problem, to be in control as everything else was falling apart. I was so focused on being thin I didn't have time to think of anything else. It drowned out everything I couldn't deal with.'
Greg cared for Clare before she died in 2016, aged 51.
Speaking on her time in rehab, she said that she was allowed to be angry in the therapy but that she was still exercising, which she compared to being an alcoholic having a drink.
Gaia went onto detail that as she battled the illness, she became covered in downy hair to keep her warm because she was that thin - which led to her mother, Emma called her her 'little mole'.
Sad: She said: 'I wanted to not be a problem, to be in control as everything else was falling apart. I was so focused on being thin I didn't have time to think of anything else' (pictured with Greg last month)
She also detailed how she would resort to lying and hiding food in her clothes, before scattering it in the garden, to hide her battle with the eating disorder.
Gaia also underwent family therapy sessions with her loved ones