Researchers in Portugal recently set out to investigate if caffeine is solely responsible for making people feel more alert, or if other parts of the morning ritual trigger that energetic feeling.
Many coffee drinkers will tell you there's something about that morning cup that other sources of caffeine just can't match.
The researchers recruited 83 people who drank at least one cup of coffee a day to undergo MRI scans so they could observe the participants' brain activity. The researchers theorized that the sight, smell or taste of coffee may help people feel alert, regardless of the caffeine content. Dr. Uma Naidoo, a nutritional psychiatrist at Harvard Medical School, said the sight of coffee may trigger positive memories or make a person believe they're about to feel more awake.
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