A study from Germany published in Diabetologia stated that there was an increased risk of developing type-2-diabetes among those who recovered from mild COVID-19 infection.

The retrospective cohort analysis included 35,865 individuals with confirmed COVID-19. The control group included 35,865 individuals with acute upper respiratory tract infections (AURI), without COVID-19 infection. It was observed that those who had COVID-19 were at a higher risk of developing type 2 diabetes compared to those with AURI (15.8 vs 12.3 per 1000 person-years). An incidence rate ratio for type 2 diabetes of 1.28 (95% CI 1.05, 1.57) was estimated after recovering from COVID-19 compared to individuals with AURI, but no increase in incidence rate ratio for other types of diabetes was observed. 

The study indicated a temporal relationship between mostly mild COVID-19 and newly diagnosed type 2 diabetes and supported active monitoring of glucose dysregulation after recovery from mild COVID-19 infection. (Medscape Medical News, March 21, 2022;Diabetologia (2022). https://doi.org/10.1007/s00125-022-05670-0)