Because diabetes can lead to complications that weaken the body to any infection.
But.... as I told you before.
Individuals with pre-existing conditions, such as type 2 diabetes, have a demonstrated higher risk for developing more severe cases of coronavirus disease 2019 (COVID-19) infection, leading to higher morbidity and mortality. A new study sheds light on improving outcomes for patients with type 2 diabetes who are infected with the virus, suggesting that a focus on blood glucose (BG) control may be key.
https://www.drugtopics.com/view/covid-19-and-diabetes-blood-sugar-control-may-help-improve-outcomes
My sugar hasn't exceed 150 mg/dl in almost 2 years. So... that's why I responded the way I did.