I've been worrying about my mother contracting it as she is diabetic, but she is not overweight and is pretty active. I know it varies from person to person, but the silver lining is that a diabetic man aged 52 years got it in the UK and he was able to overcome it.
He basically said it was like the flu for him and managed it at home, link below:
A man with type 1 diabetes has shared his experience with coronavirus. He explains, for him, the condition was “no different to normal flu-type symptoms”.
www.diabetes.co.uk