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Brittle Diabetes – Causes, Symptoms and Treatment

Brittle diabetes is a rare, unstable form of type 1 diabetes characterised by severe, unpredictable blood sugar swings despite optimal treatment.

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Things worth knowing about "Brittle Diabetes"

Brittle diabetes is a rare, unstable form of type 1 diabetes characterised by severe, unpredictable blood sugar swings despite optimal treatment.

What is Brittle Diabetes?

Brittle diabetes is a rare and particularly difficult-to-manage form of type 1 diabetes mellitus. The term describes a state of extreme, uncontrollable blood glucose fluctuations – swinging both toward dangerously high levels (hyperglycaemia) and dangerously low levels (hypoglycaemia) – that persist despite intensive medical therapy. The word “brittle” reflects the fragile and highly unstable nature of blood sugar regulation in affected individuals.

Causes

The causes of brittle diabetes are often multifactorial and may include:

Gastroparesis: Diabetes-related delayed stomach emptying, which desynchronises food absorption and insulin action.
Hormonal disorders: Conditions such as Addison's disease or thyroid dysfunction can significantly disrupt blood glucose control.
Psychosocial factors: Chronic stress, eating disorders, anxiety, or depression can impair insulin effectiveness and self-management.
Variable insulin absorption: Irregular uptake of subcutaneously injected insulin from the fatty tissue layer.
Impaired counter-regulatory hormones: Reduced glucagon or adrenaline response to hypoglycaemia, limiting the body's ability to self-correct low blood sugar.
Covert insulin manipulation: In rare cases, deliberate or unconscious destabilisation of diabetes management (e.g. in factitious disorder).

Symptoms

The hallmark of brittle diabetes is recurrent, life-threatening blood glucose dysregulation:

Repeated severe hypoglycaemic episodes, including loss of consciousness or seizures
Frequent diabetic ketoacidosis (DKA): a life-threatening condition involving dangerous acid build-up in the blood due to excess ketone bodies
Extreme glucose variability without an identifiable trigger
Frequent hospitalisations due to blood sugar emergencies
Severe impairment of daily life and overall quality of life

Diagnosis

Brittle diabetes is a diagnosis of exclusion. All potentially treatable causes of blood glucose instability must first be systematically identified and ruled out:

Continuous Glucose Monitoring (CGM): Long-term recording of glucose profiles to document variability
Gastric emptying scintigraphy: Imaging study to rule out gastroparesis
Hormonal laboratory tests: Assessment of thyroid and adrenal gland function
Psychological evaluation: Assessment of psychosocial factors and potential treatment sabotage
Hypoglycaemia awareness testing: Evaluation of the patient's ability to recognise low blood sugar in time

Treatment

Managing brittle diabetes requires a multidisciplinary team including diabetologists, psychologists, dietitians, and other specialists. Treatment is tailored to the underlying cause:

Technology-Based Approaches

Insulin pump therapy (CSII): Continuous subcutaneous insulin infusion for more stable insulin delivery
Closed-loop systems (artificial pancreas): Automated insulin dosing based on real-time CGM data
CGM with alert functions: Early warning system for impending hypo- or hyperglycaemia

Treating the Underlying Cause

Management of gastroparesis with prokinetic agents or dietary modification
Hormonal replacement therapy for adrenal or thyroid insufficiency
Psychotherapy, treatment of eating disorders or depression

Last Resort Options

Pancreas transplantation or islet cell transplantation: Considered for treatment-refractory brittle diabetes as a last resort

References

Tattersall RB. - Brittle diabetes revisited: the Third Arnold Bloom Memorial Lecture. - Diabetic Medicine, 1997; 14(2): 99–110.
American Diabetes Association. - Standards of Medical Care in Diabetes 2024. - Diabetes Care, 2024; 47(Suppl. 1).
Bilo HJG, Heine RJ. - Brittle Diabetes: Pathophysiology and Management. - In: Pickup JC, Williams G (eds.): Textbook of Diabetes. Blackwell Science, 2003.

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