Should You Wait 90 Minutes to Drink Coffee After Waking Up?
The "delay your coffee" trend has a kernel of logic but little direct evidence. Here is what the research does and does not say.
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内外兼修的健康指南。
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How Much Caffeine Is Too Much? A Guide for Busy Days
About 400 mg a day is the common limit for healthy adults. Here is what that means in real cups, and the sleep cost most people miss.
