This raises some interesting questions
The most likely consequence for an insulin-dep diabetic who injects and/or does not eat is a HYPO (low blood glucose), symptoms - aggressive foul-mouthed behaviour akin to drunkeness before coma Solution-sugar intake
Eating high carb diet without insulin injection leads to a HYPER, dehydration & potentail coma. Solution-insulin Flying also increases dehydration.
Syringes & needles can pose an airborne security threat Insulin can be fatal in a healthy individual, even pens.
Diabetes is a recognised medical disability (UK Disability Discrimination Act) Fredom to travel & access to medication could be regarded as a Human Right
Insulin dependant diabetes Type 1 manifests when a child, later onset Type 2 is normally a slow progression in middle age so rather than a Dr letter how about a passport entry or an identifiable medic-alert bracelet
Before medication is confiscated by Security the advice of an on-duty medic should be sought as per Police Dr
From NHS Direct
Hyperglycaemia High blood glucose levels
The person may be dehydrated, in a stupor or coma. They need urgent treatment for the dehydration and to correct their blood levels of certain chemicals such as glucose, potassium and sodium chloride (salt).
Prevention
In order to prevent hyperglycaemia from occurring, people with type 1 diabetes need to control their blood glucose levels by maintaining the right combination of diet and insulin injections (or tablets).
It is important not to miss or alter your dose of insulin and to maintain your fluid and food intake. It is also important that you test your blood glucose levels regularly.
Hypoglycaemia Low blood glucose levels
Symptoms
The symptoms of hypoglycaemia can include:
• headache,
• mental confusion (which may include aggressive behaviour),
• slurred speech,
• abnormal behaviour,
• loss of memory,
• numbness,
• double vision, and
• temporary paralysis and seizures (fits).
If you are hypoglycaemic, you may also experience trembling, faintness and palpitations, and excessive sweating. Sometimes, behaviour can be irrational, and disorderly, and may be mistaken for drunkenness.
The immediate treatment for a hypo is to have some food or drink containing sugar straightaway to end the attack. Examples of ideal types of food or drink include a glass of fruit juice that contains sugar, sugar lumps, chocolate, biscuits, a handful of sweets, glucose tablets or dextrose gel (such as GlucoGel).
After having something sugary, you should have a longer-acting carbohydrate food such as a few biscuits, or a sandwich.
If you have type 1 diabetes should carry glucose gel or some sugary food with them at all times. They are more likely to have a hypo than people with type 2.