Carbohydrates are sugars, and all sugars are converted into glucose (blood sugar) by the body. Glucose is then broken down into two pyruvate molecules via the glycolysis pathway. These pyruvate molecules can be used in either fermentation or respiration; respiration and the subsequent electron transport chain produce ATP (adenosine triphosphate) molecules–these are very energetic molecules and serve as the basic energy unit of the metabolic pathways.
Carbohydrates take the form of sugars, oligosaccharides, starches and fibres and are one of the three major macro-nutrients which supply the body with energy (fat and protein being the others). There is now good evidence that at least 55% of our daily calories should come from carbohydrates
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