Why are the coffee beans roasted?

Roasting process primarily changes the sugar in the beans, effecting the bitterness, sweetness and the flavor

During the roasting, beans lose about 18% weight, and may expand in size by about 80%. Light roast has mild flavor, Double roast (Almost black) has strong bitter flavor. Double roast is used to make espresso. Roasting beans does not effect the amount of caffeine.

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