Sharleen was diagnosed with ceoliac disease, a painful autoimmune condition that damages the gut, in 2014.
The star, who opened up about her condition BBC Breakfast, had previously told how gluten had “slowly been killing her”, and caused her hair to fall out.
In 2017, she told the Times: “I’d always had problems, but my energy levels were getting lower and lower and my friend Mary said, “look at food”.
“The doctor told me that gluten was killing me, I came off it and it changed my life, like, bang!”
READ MORE: Sharleen Spiteri: Independent Scotland ‘can’t survive’ as ‘we don’t have the resources’