Understanding Blood Sugar
Blood sugar — or blood glucose — is the primary fuel your cells use for energy. When you eat carbohydrates, your body breaks them down into glucose, which enters the bloodstream. Your pancreas responds by releasing insulin, a hormone that signals cells to absorb glucose.
In prediabetes, this system starts to malfunction. Either your cells become resistant to insulin's signal, or your pancreas can't produce enough insulin to keep up. The result: glucose stays elevated in your blood for longer than it should.
What Are Normal Blood Sugar Levels?
- Fasting glucose: Below 100 mg/dL is normal. 100-125 mg/dL indicates prediabetes. 126+ mg/dL suggests diabetes.
- HbA1c: Below 5.7% is normal. 5.7-6.4% indicates prediabetes. 6.5%+ suggests diabetes.
- Post-meal glucose: Should return to below 140 mg/dL within 2 hours of eating.
Understanding Glucose Spikes
After eating, your blood sugar naturally rises — that's expected. The problem occurs when it rises too high, too fast, or stays elevated for too long. These "spikes" contribute to inflammation, oxidative stress, and progressive insulin resistance.
Factors that influence the size of a glucose spike include:
- The type and amount of carbohydrates consumed
- Whether you ate fiber, protein, or fat alongside the carbs
- Your current level of insulin sensitivity
- Physical activity before and after eating
- Sleep quality the night before
- Stress levels
Practical Strategies for Stable Blood Sugar
1. Eat in the Right Order
Research shows that eating vegetables and protein before carbohydrates can reduce post-meal glucose spikes by up to 73%. This simple strategy requires no dietary restriction — just reordering what's on your plate.
2. Walk After Meals
A 10-15 minute walk after eating significantly reduces post-meal blood sugar. Your muscles act as glucose sinks, absorbing sugar from the bloodstream without needing extra insulin.
3. Pair Carbs with Protein and Fat
Never eat carbohydrates alone. Adding protein and healthy fat slows digestion and glucose absorption, creating a more gradual rise rather than a sharp spike.
4. Prioritize Sleep
Just one night of poor sleep can reduce insulin sensitivity by 25-30%. Prioritizing 7-9 hours of quality sleep is one of the most underrated blood sugar management strategies.
5. Manage Stress
Cortisol — the stress hormone — directly raises blood sugar by triggering glucose release from the liver. Chronic stress creates chronically elevated blood sugar, even without dietary changes.
Monitoring Your Progress
Tracking your blood sugar helps you understand which foods, activities, and habits affect your levels. Options include:
- Fingerstick glucose meters: Affordable and accessible. Test fasting glucose and post-meal readings.
- Continuous glucose monitors (CGMs): Provide real-time data and trend information. Increasingly accessible without a prescription.
- Regular lab work: HbA1c every 3 months gives a broader picture of average glucose control.