Welcome to the Forum!
There can be a lot of consequences if blood sugars are not kept in check.
If you can meet these, you are doing GREAT:
Normal Blood Sugars are:
Fasting BG 70-99 mg/dl
BG 2 Hours After High Carbs < 140 mg/dl
Reference
However, most of us will have to settle for this:
See Healthy Blood Sugar Targets
Good luck with your control and management.