Normal Blood Glucose Ranges: Fasting, Postprandial, Random, and Lifestyle Optimization

Reference ranges (ADA, WHO) for non-pregnant adults:

• Fasting (8+ hr fast): 70–99 mg/dL (3.9–5.5 mmol/L)
• 2-hour postprandial (after 75 g OGTT or meal): <140 mg/dL (7.8 mmol/L)
• Random: <140 mg/dL (7.8 mmol/L) typically; <180 mg/dL (10.0 mmol/L) often used as pragmatic cutoff
• HbA1c: <5.7% (<39 mmol/mol)

Lifestyle Pillars for Glycemic Health

1. Diet – Mediterranean/DASH/low-glycemic load; 25–35 g fiber; minimize refined carbs/sugars.
2. Exercise – 150 min/week moderate aerobic + 2× resistance; post-meal walks blunt spikes.
3. Weight – 5–7% loss improves insulin sensitivity dramatically.
4. Sleep – 7–9 hrs; <6 hrs → insulin resistance.
5. Stress management – Cortisol raises hepatic glucose output.
6. Smoking cessation – Smoking ↑ insulin resistance, CVD risk.
7. Alcohol moderation – ≤1 drink/day (women), ≤2 (men); avoid sugary mixers.

Individual targets may differ (e.g., elderly, CKD, pregnancy). Work with your care team for personalized goals.