by Marie
QUESTION: I have prediabetes. I eat protein and vegetables and exercise. My glucose is about 120 mg/dL two hours after lunch, but my fasting glucose is usually 110–120 mg/dL. I also drink bitter melon juice and take biotin at night. How can I lower my morning fasting glucose?
A confirmed fasting glucose of 110–120 mg/dL is in the prediabetes range and deserves active prevention, although it is not diabetes. Proven steps include a sustainable eating pattern, regular aerobic and resistance activity, weight reduction when appropriate, adequate sleep, and treatment of sleep apnea. Bitter melon and biotin are not proven treatments. Confirm the pattern with laboratory fasting glucose and HbA1c, then discuss a diabetes-prevention program and whether metformin fits your risk level.
Answer by Dr. Albana Greca, MD, MMedSc
Hi Marie,
Your two-hour result of 120 mg/dL after an ordinary lunch is reassuring, but it is not a diagnostic glucose-tolerance test. Laboratory fasting glucose of 100–125 mg/dL is classified as prediabetes. See the standard fasting blood sugar ranges.
A fasting test requires at least eight hours without calories; water is allowed. Check at a consistent time with clean, dry hands. Home meters show patterns, but diagnosis and follow-up should use laboratory fasting glucose and HbA1c.
Prediabetes is also defined by HbA1c of 5.7–6.4% or a two-hour 75-gram glucose-tolerance result of 140–199 mg/dL. Your clinician may use one or more of these blood tests for diabetes.
Before waking, hormones signal the liver to release glucose for the day. With insulin resistance, the liver may release more glucose than the body handles efficiently. This is often called the dawn phenomenon. Read why blood sugar rises in the morning and our guide to high morning glucose.
A large late meal, poor sleep, sleep apnea, illness, stress, steroid medicines, or reduced activity may also increase the morning result.
You do not need to remove all carbohydrate or eat only protein and vegetables. Choose a sustainable Mediterranean-style or moderately lower-carbohydrate pattern. Emphasize nonstarchy vegetables, legumes, whole fruit, suitable whole grains, lean protein, nuts, seeds, and unsaturated fats. Reduce sugary drinks, sweets, refined grains, and large portions of highly processed foods.
Dinner does not have to occur exactly four hours before sleep. Keep portions moderate, avoid repeated late-night snacking, and note whether large evening carbohydrate portions affect the morning. Use our foods and blood sugar guide and diabetes plate method.
A short walk after dinner may help, but one session is not a cure. Work toward at least 150 minutes of moderate activity each week and include resistance exercise two or more times weekly when appropriate. Breaking up long sitting periods also helps. See exercise and diabetes safety.
If you have overweight or excess abdominal fat, losing about 5–7% of starting weight can significantly reduce progression to type 2 diabetes. Use the BMI and waist-to-height calculator as a screening tool and set an individualized goal with your clinician or dietitian.
Aim for a regular schedule and enough restorative sleep—often around seven to nine hours for adults. Loud snoring, breathing pauses, morning headaches, or daytime sleepiness may indicate sleep apnea, which can worsen insulin resistance.
Bitter melon juice has not been proven to prevent diabetes or reliably lower fasting glucose. Products vary in strength and may cause digestive symptoms or interact with glucose-lowering medicines. Review its use with your clinician rather than changing the timing or increasing the amount.
Biotin is a vitamin, not a prediabetes treatment. High-dose biotin can interfere with certain laboratory tests and produce misleading results. Tell your clinician and laboratory the dose before testing. Review our supplement safety guide.
Lifestyle treatment is the foundation, but metformin is sometimes considered when risk is higher—for example, fasting glucose 110–125 mg/dL, HbA1c at least 6.0%, BMI 35 or higher, age 25–59, or previous gestational diabetes. Kidney function, side effects, pregnancy plans, and preferences must be reviewed.
Do not start medicine solely to force one morning reading below 100. The goal is to reduce overall diabetes and cardiovascular risk safely.
Arrange prompt testing if fasting glucose repeatedly reaches 126 mg/dL or higher, HbA1c reaches 6.5% or higher, or you develop excessive thirst, frequent urination, blurred vision, recurrent infections, or unexplained weight loss. Seek urgent care for vomiting, difficult breathing, confusion, severe dehydration, high ketones, glucose above 400 mg/dL, or a meter displaying “HI.”
Fasting glucose of 110–120 mg/dL is not an emergency, but it is not fully normal. Focus on laboratory trends and proven prevention measures. Bitter melon and biotin should not distract from nutrition, activity, weight, sleep, cardiovascular-risk assessment, and timely follow-up.
Educational safety note: This answer is for general diabetes education only. It does not replace personal medical advice, diagnosis, or treatment. Do not start, stop, or change supplements, metformin, other medicines, diet, fasting, or exercise without speaking with your healthcare provider.
Last reviewed: July 2026.