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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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AA (amino acid)
AA (amino acid): Stands not only for Alcoholics Anonymous but also for amino acids, the building blocks of proteins. There are 20 amino acids from which proteins are assembled. Of these 20 amino acids, 9 are deemed "essential" in that the human body cannot make them so they are needed in the diet.