Blood sugar, or blood glucose, is the amount of glucose present in the blood. Glucose is a primary source of energy for the body's cells, and it comes from the food we eat. The body regulates blood sugar levels to ensure they remain within a healthy range, primarily through the actions of the hormone insulin.

### Key Points About Blood Sugar:

1. **Normal Ranges**:

   - **Fasting Blood Sugar**: Typically between 70-99 mg/dL (3.9-5.5 mmol/L) for adults.

   - **Postprandial (after eating)**: Less than 140 mg/dL (7.8 mmol/L) two hours after a meal.

   - **A1C (Hemoglobin A1c)**: Reflects average blood sugar levels over the past 2-3 months; a normal A1C level is below 5.7%.

2. **Regulation**:

   - **Insulin**: A hormone produced by the pancreas that helps cells absorb glucose from the bloodstream.

   - **Glucagon**: Another hormone from the pancreas that triggers the release of glucose stored in the

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