Why a normal long-term blood sugar value doesn’t always mean the all-clear – and which blood markers can actually reveal your glucose metabolism early on.
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Summary
This summary was generated automatically by AI from the episode transcript and translated into English. It may contain errors or omissions and does not replace medical advice.
In this episode, Mario and Max explain why HbA1c, a measure of long-term blood glucose levels, is not enough on its own to assess glucose metabolism. They introduce the HOMA index, calculated from fasting insulin and fasting glucose, as a more sensitive early warning marker for insulin resistance. They discuss how insulin resistance often begins years before overt diabetes develops, and the role lifestyle factors such as diet, exercise, and muscle mass play in its development and reversibility.
Mario and Max introduce two key measures for assessing glucose metabolism. HbA1c, a measure of long-term blood glucose levels, measures the proportion of glycated hemoglobin and is an established marker, but it rises relatively late. The HOMA index, calculated from fasting glucose and fasting insulin, is considerably more sensitive. It can indicate developing insulin resistance years before HbA1c moves outside the normal range because it captures the compensatory rise in insulin.
Insulin resistance often develops over the 10–13 years before an actual diabetes diagnosis. Elevated fasting insulin is an early indicator, while HbA1c and fasting glucose may still be normal. Later in the process, as the pancreas becomes exhausted, these values also rise. The traditional model, in which insulin resistance leads to high insulin levels, is complemented by a newer model suggesting that initially high insulin levels are already an independent risk factor.
Both values can be distorted by external circumstances. HbA1c can be falsely elevated in people with iron deficiency, for example due to heavy menstrual bleeding or a vegan diet. The HOMA index is sensitive to acute stress, sleep deprivation, the menstrual cycle, or intense exercise the previous day. For a valid measurement, it is therefore essential to fast for 8–12 hours and arrive for your blood draw under conditions as free from these influences as possible.
The tendency to metabolize glucose less efficiently has a strong genetic component. Whether this develops into diabetes, however, depends largely on lifestyle. Factors such as a diet high in processed, simple carbohydrates and the constant availability of food contribute to elevated fasting insulin. The most decisive factor, however, is the loss of muscle mass. Muscles are the body's largest reservoir and consumer of glucose.
Insulin resistance is reversible at most stages. The most effective intervention is exercise, particularly strength training to build muscle mass, which acts as a "metabolic sponge" for glucose. Other important pillars are a diet rich in protein and fiber, based on the Mediterranean diet, adequate sleep, and stress management. Even with established diabetes, consistent lifestyle changes can often lead to improvement or even remission.
Insulin resistance can develop years before fasting glucose or HbA1c becomes abnormal. We explain fasting insulin, HOMA-IR, early warning signs, testing pitfalls and the lifestyle strategies that can improve insulin sensitivity.
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