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If you cannot store or burn up the glucose you’ve consumed, you may have the beginnings of high fasting glucose, or excess sugars dissolved in your plasma or blood. This is why the typical doc’s office annual visit involves a test for fasting glucose, to determine if you’re metabolically handling sugar and associated hormones (e.g., insulin and leptin) okay.
You can keep your blood-sugar metabolism out of the prediabetic range (measured by some medical associations or countries’ standards as a persistent fasting glucose level of 100 or more) by keeping your calorie and carb consumption within bounds—i.e., in line with your total energy expenditure. Intermittent fasting helps lower your fasting glucose levels (see Chapter 6).