PH
Many people think coffee only works after taking a sip, but the smell alone can make you feel more alert. Researchers believe the familiar aroma signals your brain to prepare for increased attention and focus. For people who drink coffee regularly, the scent becomes associated with waking up and starting the day.
This psychological effect can make you feel more awake even before caffeine enters your body. It's an example of how your brain connects smells with habits and expectations. Sometimes your nose wakes up before your coffee does.
© Harvard Medical School
