https://tw.appledaily.com/lifestyle/daily/20080214/30258619
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黑巧克力的可可豆濃度80％、90％，品嚐時易忽略咖啡因濃度。10顆就有123毫克的咖啡因，等於1杯熱咖啡。以60公斤者為例，每日咖啡因攝取應控制在300毫克以下，約25顆黑巧克力，或2杯咖啡，若當天已吃太多黑巧克力，就不宜再喝咖啡，否則恐引發心悸。
References
https://tw.appledaily.com/lifestyle/daily/20080214/30258619可可豆含量愈濃 咖啡因愈高
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