since they contain caffeine
Coffee, colas and tea aren't the best sources, since they contain caffeine, a diuretic that induces water loss
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since they contain caffeine
因为它们含有咖啡因
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The AAP has advised pediatricians to recommend to their patients not to use these products and energy drinks, since they contain potentially high amounts of stimulants such as DMAA and caffeine, which can elevate the possibility for developing dehydration, palpitations or dangerous arrhythmias, or insomnia.
FORBES: Is DMAA Dangerous To Your Health?