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Macronutrients – Carbohydrates

Glucose

Primary blood sugar and cellular fuel regulated by insulin for energy production.

Definition

A monosaccharide simple sugar and primary fuel for cells, transported in blood and regulated by insulin for energy metabolism.

How it works

Glucose is a 6-carbon monosaccharide and the body's preferred energy substrate, derived from carbohydrate digestion and gluconeogenesis (liver glucose synthesis). It circulates in the bloodstream and enters cells through glucose transporters, where it undergoes glycolysis and oxidation to produce ATP (cellular energy currency). Blood glucose levels are tightly regulated by insulin (which lowers glucose) and glucagon (which raises glucose), maintaining homeostasis between 70-100 mg/dL fasting. Dysregulation of glucose metabolism leads to prediabetes and type 2 diabetes.

Role

Serves as the primary cellular fuel and blood energy currency, regulated by insulin for optimal metabolic function.

Examples

  • Table sugar
  • Honey
  • Grains
  • Legumes
  • Fruits
  • Potatoes
  • Dextrose

Recommendations

Obtain glucose primarily from complex carbohydrates with high fiber content. Monitor blood glucose through regular testing if at metabolic risk. Balance carbohydrate intake with protein and fat to moderate glucose absorption.

Key takeaway

Glucose is the body's primary fuel, and stable blood glucose levels are essential for metabolic health and disease prevention.

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