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To investigate whether caffeine intake among adolescents and adults in the U.S. varies across the week or throughout the day, data from a 7-day online beverage consumption survey (2010–2011) were analyzed. Mean (206.8–213.0 mg/day) and 90th percentile (437.4–452.6 mg/day) daily caffeine intakes among consumers 13 years and older were relatively constant across the week with no marked difference among...
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