Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

Understanding How Diabetes Injures Nerves

Diabetic peripheral neuropathy — the most common complication of diabetes — affects approximately 50% of patients with long-standing type 2 diabetes and a significant proportion of type 1 patients. Understanding the mechanisms through which hyperglycemia damages peripheral nerves helps patients understand why glucose control matters and why symptoms develop in predictable patterns. At Balance Foot & Ankle in Howell and Bloomfield Township, Michigan, we explain diabetic neuropathy in the context of comprehensive diabetic foot care.

The Metabolic Mechanisms

Chronic hyperglycemia damages nerves through several converging pathways. The polyol pathway: excess glucose is converted to sorbitol and fructose by aldose reductase, accumulating within nerve cells and causing osmotic stress, oxidative damage, and reduced myoinositol that disrupts nerve signaling. Advanced glycation end-products (AGEs): glucose non-enzymatically bonds to proteins in nerve myelin and axonal structures, impairing nerve function and causing structural damage over time. Oxidative stress: the metabolic disturbances of hyperglycemia generate reactive oxygen species that damage nerve mitochondria, reducing energy production essential for nerve function and repair.

Vascular Damage Compounds Nerve Injury

Peripheral nerves are highly dependent on adequate blood supply from small vessels (vasa nervorum). Diabetes causes microvascular disease — thickening of capillary basement membranes and endothelial dysfunction — that reduces nerve blood flow. Combined metabolic and ischemic nerve injury produces more severe neuropathy than either mechanism alone. This explains why the combination of hyperglycemia AND hypertension, dyslipidemia, and smoking (all vascular risk factors) dramatically increases neuropathy risk beyond glucose alone.

Why Feet Are Affected First

Diabetic neuropathy is length-dependent — the longest nerves are affected first and most severely. The nerves supplying the feet are the longest peripheral nerves in the body, explaining why the classic pattern is “stocking-and-glove” distribution with symptoms starting at the toes and feet before progressing proximally. The feet also have the most distal and smallest blood vessels, making them most vulnerable to microvascular damage. This anatomical reality means that foot symptoms are typically the earliest sign of peripheral neuropathy — and the feet remain the most severely affected. Contact Balance Foot & Ankle at (810) 206-1402 for comprehensive diabetic foot evaluation including neuropathy assessment and risk stratification.

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Balance Foot & Ankle — Howell & Bloomfield Township, MI

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When to See a Podiatrist for Diabetic Neuropathy

Understanding how diabetes damages foot nerves helps you protect your feet and prevent complications. At Balance Foot & Ankle, Dr. Tom Biernacki provides comprehensive diabetic neuropathy screening, risk stratification, protective footwear programs, and treatments to slow nerve damage progression.

Learn About Our Neuropathy Treatment Options | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Pop-Busui R, Boulton AJ, Feldman EL, et al. Diabetic neuropathy: a position statement by the American Diabetes Association. Diabetes Care. 2017;40(1):136-154.
2. Boulton AJ, Vinik AI, Arezzo JC, et al. Diabetic neuropathies: a statement by the American Diabetes Association. Diabetes Care. 2005;28(4):956-962.
3. Callaghan BC, Cheng HT, Stables CL, et al. Diabetic neuropathy: clinical manifestations and current treatments. Lancet Neurol. 2012;11(6):521-534.

Dr. Tom Biernacki, DPM

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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.