148: Why Neuropathy Isn’t Just About Blood Sugar

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Topic:

Peripheral neuropathy is not caused by high glucose alone, but by the combined effects of hyperglycemia, insulin resistance, and glycemic variability. Protecting nerves requires improving insulin sensitivity and reducing glucose swings—not just lowering A1C.

Summary:

Dr. Bikman explains why peripheral neuropathy is not simply a “high blood sugar” problem. While hyperglycemia clearly damages nerves, the story is more complex—especially in type 2 diabetes, where intensive glucose control does not prevent neuropathy nearly as well as it does in type 1 diabetes. Dr. Bikman argues that neuropathy is driven by three interacting metabolic forces: chronic hyperglycemia, insulin resistance, and glycemic variability.

He begins by defining peripheral neuropathy as damage to the nerves outside the brain and spinal cord, most commonly appearing first in the feet and toes because the longest nerves are often affected earliest. He then explains how excess glucose damages nerves through the sorbitol pathway, oxidative stress, glycation, and inflammation. But glucose is only one part of the problem.

The second pillar is insulin resistance. Peripheral nerves and their support cells, especially Schwann cells, need insulin signaling to maintain healthy myelin and nerve repair. When insulin signaling fails, nerves lose an important trophic support system even before glucose becomes severely elevated. The third pillar is glycemic variability, or repeated glucose swings, which may damage nerves beyond what A1C alone can reveal.

The key takeaway is that protecting nerves requires more than lowering average blood sugar. It requires improving insulin sensitivity, reducing glucose swings, stabilizing post-meal responses, and addressing the metabolic dysfunction that damages nerves from multiple directions.

References:

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NOTE: The information presented is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Dr. Bikman is not a clinician—and, he is not your doctor. Always seek the advice of your own qualified health providers with questions you may have regarding medical conditions.

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