Carbs are broken down into 2 groups. Simple and complex carbs. When those are broken down the result is what you are referring to which is glucose. There are different forms of sugar. Each type is considered a carbohydrate. So essentially bread would be a chain of simple carbs that need to be broken down into glucose so that the body can use it as fuel. Now you want to really see something interesting? Look up gluconeogenesis. Thats when the body takes the excess protein and fat from food and turns it into glucose.
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