Whether glucose is useful for blood sugar depends on the context. Glucose is the main blood sugar and essential for energy. For people with diabetes, measuring glucose is critical for management – evidence is human-strong (clinical guidelines). For healthy individuals without metabolic issues, routine glucose monitoring (e.g., via CGM) has limited proven benefit; evidence is practice/mixed. Glucose as a supplement (e.g., in sports drinks) can be useful during endurance exercise, but excess intake is counterproductive for daily health. Caveat: Direct-to-consumer blood sugar tests are not diagnostic and may give false reassurance. Genetic variants (e.g., in GCK or TCF7L2) have small effects on glucose levels and are overshadowed by lifestyle. Conclusion: Glucose is useful as a biomarker in specific clinical or athletic contexts. For the general population, established markers like HbA1c and fasting glucose are more actionable.
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