Diabetes Diagnosis and Fatty Liver: Key Insights - Family Medicine

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Diagnosis of Diabetes and Fatty Liver Disease


Hello, I would like to ask if a fasting blood glucose level of 126 mg/dL or higher can be considered as type 2 diabetes, or is it necessary to have two separate diagnoses? If two diagnoses are required, how far apart are these tests typically conducted? For instance, if a routine health check is done every year, and my blood glucose level exceeds the threshold in the first year, is normal in the second year, but exceeds it again in the third year, and I do not exhibit any symptoms of diabetes, how would this situation generally be assessed? Additionally, I would like to know if individuals with fatty liver are recommended to be screened for diabetes.
Lastly, is there a correlation between elevated ALT levels and diabetes? Thank you very much for your response!

sd, 20~29 year old female. Ask Date: 2022/08/21

Dr. Hou Angting reply Family Medicine


Hello: If your fasting blood glucose is above 100, it is recommended that you maintain a healthy diet and engage in moderate exercise.
Additionally, you should visit a family medicine physician for follow-up and assessment three months after your last test.
The causes of fatty liver are often related to an imbalanced diet, being overweight, and excessive alcohol consumption, all of which are also risk factors for diabetes.
Wishing you good health.

Reply Date: 2022/08/21

More Info


When it comes to diagnosing diabetes, particularly type 2 diabetes, the criteria established by the American Diabetes Association (ADA) are quite clear. A fasting blood glucose level of 126 mg/dL or higher is indeed one of the diagnostic criteria for diabetes. However, it is important to note that a single elevated reading is not sufficient for a definitive diagnosis. The ADA recommends that a diagnosis of diabetes should ideally be confirmed by a second test on a different day, unless there are clear symptoms of hyperglycemia or a hyperglycemic crisis.

The time interval between the two tests can vary, but it is generally recommended to conduct the follow-up test within a few days to a week. This allows for a timely assessment while also accounting for any potential fluctuations in blood glucose levels due to factors such as diet, stress, or illness. If you have an elevated fasting blood glucose reading in one year, a normal reading the following year, and then another elevated reading the year after, it would be prudent to consult with a healthcare provider. They may recommend further testing, such as an oral glucose tolerance test (OGTT) or checking HbA1c levels, to get a clearer picture of your glucose metabolism over time.

Regarding the relationship between fatty liver disease (non-alcoholic fatty liver disease, or NAFLD) and diabetes, there is a significant connection. Individuals with fatty liver are at a higher risk of developing insulin resistance, which is a key factor in the development of type 2 diabetes. Therefore, it is advisable for individuals diagnosed with fatty liver to undergo regular screening for diabetes. This is particularly important because many people with insulin resistance or early-stage diabetes may not exhibit noticeable symptoms.

As for the relationship between elevated ALT (alanine aminotransferase) levels and diabetes, there is indeed a correlation. ALT is an enzyme found primarily in the liver, and elevated levels can indicate liver inflammation or damage. Studies have shown that higher ALT levels are associated with an increased risk of developing type 2 diabetes. This is likely due to the underlying metabolic disturbances that accompany both conditions, such as insulin resistance and inflammation.

In summary, if you have a fasting blood glucose level of 126 mg/dL or higher, it is crucial to follow up with a healthcare provider for further testing. Regular screening for diabetes is recommended for individuals with fatty liver disease, given the increased risk of insulin resistance and diabetes. Additionally, monitoring liver enzymes like ALT can provide valuable insights into your metabolic health and potential diabetes risk. Maintaining a healthy lifestyle, including a balanced diet and regular physical activity, is essential for managing both blood sugar levels and liver health. If you have concerns about your health, it is always best to consult with a healthcare professional who can provide personalized advice and guidance based on your specific situation.

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