Thse are some of the symptoms:
2. Problem with eye sight
3. Filing tired during working hours
4. Too much resting or sleeping
5. Loos focus or consentration
6. Desire to take more sugar or starch containing food.
These are some I know of. Old people are at high risk of getting diabetes if consume too much sugar at an early age.
Note: you can see your fingers just below the nails is dark, it implies your sugar level is high or low.