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Is fasting blood sugar 120 mg/dL a sign of prediabetes?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hi doctor,

I have had diabetes for the past year. I took a home diabetes test with the kit, and it showed 120 mg/dL on an empty stomach. I have severe dryness in my mouth and a fast heartbeat.

  1. Is this a diabetic or a prediabetic stage?
  2. Also, I always feel exhausted. Are all these symptoms related to diabetes?
  3. How to treat this with diet?

Please help.

Thank you.

Hi,

Welcome to icliniq.com.

I understand your concern.

A fasting blood glucose level of 120 mg/dL indicates that you may be in the prediabetic stage, also known as impaired fasting glucose (IFG). Prediabetes is a condition where blood sugar levels are higher than normal but not yet high enough to be classified as type 2 diabetes.

It is crucial to consult with your healthcare provider to discuss your test results and receive proper guidance on managing your condition. The symptoms you mentioned, such as dry mouth, fast heartbeat when climbing stairs, and constant fatigue, can be related to diabetes or prediabetes. However, confirming the diagnosis with a healthcare professional is essential, as other health issues can also cause these symptoms.

To treat prediabetes with diet, you can follow these general recommendations:

1. Include a variety of fruits, vegetables, whole grains, lean proteins, and healthy fats in your meals.

2. Pay attention to the quantity of food you consume, as overeating can lead to weight gain and worsen blood sugar levels.

3. Reduce your intake of sugary beverages, sweets, and processed foods high in added sugars.

4. Opt for whole grains, such as brown rice, quinoa, whole wheat bread, and oats, instead of refined grains.

5. Increase your fiber intake through fruits, vegetables, whole grains, and legumes, as fiber can help regulate blood sugar levels.

6. Be mindful of the carbohydrates you consume, as they can affect blood sugar levels. Choose complex carbohydrates and balance your meals with protein and healthy fats.

7. Drink plenty of water throughout the day to help regulate your body's processes.

8. They can provide personalized dietary advice based on your needs and health conditions.

In addition to dietary changes, regular physical activity, maintaining a healthy weight, and managing stress can also help improve blood sugar control.

I hope this information will help you.

Thank you.

Medically reviewed byiCliniq medical review team

Published At June 4, 2026
Reviewed AtJune 4, 2026

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