She is a stalwart on BBC Radio Scotland, Radio Three and Radio Four, as well as setting up a podcasting production firm, the Big Light.
She said: “I’d hoped that I was simply worn out by my many years as a freelance broadcaster and perhaps exhausted following the loss of our dear mother, Patricia, the previous Christmas, but sadly, I now have a firm diagnosis of early-onset Alzheimer’s disease.
Louise Thornton, the head of commissioning at BBC Scotland, paid tribute to Ms Forsyth, saying: “Janice has been a hugely popular personality on our airwaves for many years.
While she said she would be withdrawing from social media “for now”, Ms Forsyth plans to continue work for the podcasting firm she established with producer Fiona White, saying “I’m not done yet”.
The BBC Radio Scotland presenter has worked for the broadcaster for 30 years.
