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Graph of blood glucose after meal

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blood glucose curve after meal normal postprandial response graph physiology

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Here is the postprandial blood glucose graph showing both the normal response and the diabetic response:
Postprandial Blood Glucose Curve - Normal vs Diabetes Mellitus

Blood Glucose After a Meal - Explained

Normal Physiology (Green Curve)

Time PointBlood Glucose
Fasting (0 min)~70-100 mg/dL
Peak (~60 min)~120-140 mg/dL
2 hours post-meal<140 mg/dL
3-4 hoursReturns to fasting baseline
What happens step by step:
  1. 0-30 min - Carbohydrates from the meal are digested and absorbed in the small intestine. Glucose enters the portal circulation, causing blood glucose to rise.
  2. 30-60 min - Blood glucose peaks. The pancreatic beta cells respond with a two-phase insulin release:
    • First phase: Rapid burst of pre-formed insulin within 2-5 minutes of glucose sensing
    • Second phase: Sustained insulin synthesis and release over the next 1-2 hours
  3. 60-120 min - Insulin drives glucose uptake into skeletal muscle, liver (glycogen synthesis), and adipose tissue. Blood glucose falls back toward baseline.
  4. 2+ hours - Blood glucose normalizes. Glucagon from alpha cells helps prevent overshoot into hypoglycemia.
The physiological delta (post-meal minus pre-meal) should be 0-50 mg/dL - Textbook of Family Medicine 9e.

Diabetic Response (Pink Curve)

In Type 2 Diabetes / Impaired Glucose Tolerance:
  • The first-phase insulin response is blunted or absent
  • Glucose peaks much higher (>180-200 mg/dL)
  • The curve stays elevated well beyond 2 hours (>200 mg/dL at 2 h = diagnostic of diabetes)
  • The prolonged hyperglycemia causes vascular and oxidative stress
Diagnostic cut-offs (2-hour post 75g glucose load - OGTT):
  • Normal: <140 mg/dL
  • Impaired glucose tolerance (pre-diabetes): 140-199 mg/dL
  • Diabetes mellitus: ≥200 mg/dL

Key Hormones Involved

HormoneSourceEffect
InsulinPancreatic beta cellsLowers glucose (uptake, glycogen synthesis, inhibits gluconeogenesis)
GlucagonPancreatic alpha cellsSuppressed post-meal; rises if glucose drops too low
GLP-1, GIP (incretins)Gut L/K cellsAmplify insulin secretion in response to food
AmylinCo-secreted with insulinSlows gastric emptying, blunts postprandial glucose spike
Sources: - Textbook of Family Medicine 9e | - Nutrisense: Glucose Curve | - ScienceInsights: Normal Glucose Graph
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