Karina not 100% but im sure it is only diabetics on insulin who are at risk of hypoing that need to inform the DVLA,but as a none driver im far from an expert
I found this
Who do I need to inform about my diabetes?
No matter how your diabetes is treated, you must by law inform your insurance company that you have diabetes.
If your diabetes is treated with insulin, you must inform the DVLA.
If you are applying for a driving licence for the first time, and your diabetes is treated with tablets or insulin, you also must inform the DVLA.
You must inform the DVLA if any diabetes complications develop that may affect your ability to drive safely.
If you fail to inform the DVLA or your insurance company then your driving insurance will be invalid.
You do not need to tell the DVLA if you are treated by diet alone or by tablets that do not bring on hypoglycemia. However, if you change from tablets to insulin treatment, then they must be informed.
You do not need to tell the DVLA if you are treated by:
Diet alone
By tablets which carry no risk of hypoglycemia
Non-insulin injectable medication such as Byetta or Victoza (unless you are also on tablets which do carry a risk of hypos)
Tablets which are deemed to carry a risk of hypoglycemia are sulfonylureas and prandial glucose regulators.