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Key Points

• This research investigates how morning coffee influences alertness and mood throughout the day.
• Participants were randomly assigned to coffee or placebo groups.
• Measurements included alertness and mood ratings after consumption.
• Follow-up assessments occurred over a four-hour period.
• Morning coffee increased alertness scores by 30% compared to placebo, p<0.01.
• Participants reported improved mood with a 20% increase in positive mood ratings, p<0.05.
• Energy levels were significantly higher in the coffee group than placebo, p<0.01.