How can I tell if my diet changes are actually helping to reduce my fasting blood sugar levels?

Track fasting blood sugar (FBS) trends over 2-4 weeks alongside diet logs to confirm improvements from changes like low-carb or IF. Consistent drops toward <100 mg/dL (non-diabetic) or <126 mg/dL (diabetic) signal success, verified by HbA1c.

Key Tracking Methods

Daily FBS Monitoring

  • How: Glucometer same time daily (e.g., 7 AM post-8h fast).

  • Success signs: -10-20 mg/dL drop in 1-2 weeks; stable 80-99 mg/dL.

  • Log: App (MySugr/Glucose Buddy) notes meals/sleep/exercise.

CGM for Precision

  • Freestyle Libre/DEXCOM: Real-time FBS + overnight patterns.

  • Metrics: Time-in-range >70% (70-140 mg/dL); reduced dawn phenomenon spikes.

Supporting Indicators

Beyond numbers:

  • Energy: Steady, no crashes.

  • Weight: 0.5kg/week loss correlates with FBS drop.

  • Symptoms: Less thirst/fatigue.

Table: FBS Response Timeline

Week Expected Change Diet Trigger
1 -5-15 mg/dL Carb cut <100g/day
2-4 -20+ mg/dL IF + protein 1.6g/kg
Ongoing HbA1c -0.5% Consistent habits

 

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