Think your morning coffee makes you mentally sharper? Study suggests caffeine may not give your brain the boost you expect

For millions of individuals, the first cup of coffee marks the official start of the morning. In addition to keeping us awake, caffeine is frequently used before work, studying, or any other endeavour that calls for focus. However, a well-known belief is being called into question by recent research: feeling more stimulated after consuming coffee does not always imply that your brain will function better on hard mental activities. According to a study that was published in the journal Nutrients, caffeine did not significantly improve the sophisticated cognitive tests that were administered in the morning.

What did researchers test with coffee?

51 physically active males who were moderate or somewhat inexperienced frequent caffeine drinkers were the subjects of a study conducted by researchers from Liverpool John Moores University and partner institutions. Three experimental conditions were completed by the participants. At about 6:30 am, they were given either 300 mg of caffeine, a placebo, or no pill. An hour later, they were tested. Nutrition, sleep, and other factors were closely monitored. Along with mood and reactive agility, researchers evaluated cognitive skills like executive function, attention, memory, and reaction. The result was surprisingly uneventful: caffeine did not significantly improve the cognitive measures, mood or reactive agility compared with the placebo and no-pill conditions.

Why didn't caffeine make them mentally sharper?

The cognitive effects of caffeine may be very dependent on the type of mental task being performed and the individual's circumstances. Prevention was informed by study co-author João Agulhari that prior studies have demonstrated that caffeine can support very basic cognitive functioning and may mitigate the consequences of sleep loss. The latest research indicates that those advantages might not always apply to higher-order cognition in individuals who are already getting enough sleep. A 200 mg dose of caffeine was linked to worse spatial working-memory performance and did not enhance verbal working memory, according to a 2024 randomised, double-blind trial involving regular coffee and tea drinkers.

Does this mean your morning coffee is useless?

You might still feel more prepared for the day after drinking coffee in the morning, but this feeling shouldn't be mistaken for mental acuity. The effects of coffee vary depending on the individual, task, dose, sleep, and time. Therefore, the science provides a helpful reality check: a caffeine buzz and a cognitive boost aren't always the same thing, even though coffee drinkers don't need to give up their morning routine.