From Prediabetes to Type 2 Diabetes | AI Learning Guide

The list shows four stages, but they are not four separate diseases. They are snapshots of one process. In the first stage, resistance is present and compensation is complete, so glucose looks normal. In the second, the early insulin burst after a meal is lost, so post-meal glucose rises while fasting glucose may still look fine. In the third, fasting glucose and HbA1c finally cross the threshold. In the fourth, beta-cell function keeps falling, which is why treatment often has to be increased over time. The note is the key idea: each stage is defined by the relationship between resistance and secretion, not by one glucose number.

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Stages of progression

Normal glucose with insulin resistance: beta cells compensate fully, insulin levels are high, fasting glucose and HbA1c are normal.
Prediabetes: first-phase insulin release is lost, post-meal glucose rises, fasting glucose may still be normal.
Type 2 diabetes: fasting glucose and HbA1c cross diagnostic thresholds as beta-cell function falls further.
Established diabetes: beta-cell function continues to decline, requiring treatment intensification over time.

The stages are defined by the balance between insulin resistance and insulin secretion. A single glucose measurement captures only one point on that trajectory.