Fasting blood sugar levels and health
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Fasting Blood Sugar Levels and Cardiovascular Health
Fasting blood sugar (FBS) levels are a key indicator of how the body manages blood sugar and are closely linked to overall health, especially cardiovascular health. High FBS levels over time can increase the risk of developing cardiovascular disease (CVD), even in people who do not have diabetes. Studies show that even FBS levels in the high-normal range are associated with a higher risk of CVD and cardiovascular death in otherwise healthy individuals 1389. This means that monitoring and managing FBS is important not just for people with diabetes, but for everyone concerned about heart health.
Risks of Low and High Fasting Blood Sugar
Both low and high FBS levels can be harmful. Research shows that people without diabetes or CVD who have very low fasting glucose levels (below 4.0 mmol/L) face increased risks of all-cause mortality, stroke, and major cardiovascular events compared to those with normal FBS levels . On the other hand, high-normal FBS levels (for example, 95-99 mg/dL) are also linked to increased CVD risk, even before reaching the threshold for prediabetes or diabetes 38. In older adults with diabetes, the relationship between FBS and health outcomes is J-shaped: both low and high FBS levels are linked to higher mortality and cardiovascular events, with the lowest risk seen in the mid-range (95-124 mg/dL) .
Fasting Blood Sugar and Diabetes Management
For people with diabetes, maintaining FBS within a healthy range is crucial. Factors such as good self-care, absence of other chronic illnesses, and proper treatment regimens are associated with better FBS control . Psychological distress and comorbidities can make it harder to keep FBS at target levels, highlighting the need for comprehensive care that addresses both physical and mental health .
Intermittent Fasting and Fasting Blood Sugar
Intermittent fasting (IF) and energy-restricting diets have been shown to significantly reduce FBS, insulin levels, and insulin resistance in people with type 2 diabetes and those who are overweight or obese 4610. Short-term studies found that IF can lead to weight loss, improved morning blood glucose, and reduced post-meal glucose variability, with most participants tolerating the regimen well 410. However, these interventions did not significantly change long-term blood sugar control (HbA1c) in the short term . More research is needed to understand the long-term effects and optimal fasting strategies.
Predicting and Managing Fasting Blood Sugar
Predicting FBS levels can help in early identification and management of diabetes and CVD risk. Machine learning models, such as logistic regression, have been developed to predict FBS and support healthcare providers in managing patient risk . Regular monitoring and early intervention can help prevent the progression from normal FBS to impaired fasting glucose or diabetes, reducing the risk of heart disease and other complications 19.
Conclusion
Fasting blood sugar levels are a critical marker for both diabetes and cardiovascular health. Both high and low FBS levels can increase health risks, making it important to maintain FBS within an optimal range. Lifestyle interventions like intermittent fasting and good self-care practices can help manage FBS, especially in people with type 2 diabetes. Regular monitoring and early intervention are key to preventing complications and improving long-term health outcomes.
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