When people feel tired, they often think of drinkingcoffeeto stay awake.However, a recent study published in the European Journal of Nutrition found that drinking a glass (approximately 240 ml)of orange juicecan also help people stay awake.

In the study, Dr. Daniel Lambert and his research team at the University of Reading conducted a series of psychological tests on 24 young participants over two days.On one day, the participants drank a glass of orange juice before taking the test;on the other day, the participants drank a sugary drink that looked and tasted similar to orange juice before taking the test.The results showed that after drinking orange juice, the participants' alertness, attention, and reaction speed were all significantly improved.More importantly, the alertness induced by drinking orange juice lasted for up to 6 hours.Compared toeating breakfastwithout drinking orange juice, eating breakfast with orange juice helped the participants feel more alert in the afternoon.

Dr. Lambert explained that the ability of orange juice to improve alertness is due to its flavonoid content.These healthy plant-based substances are found in various fruits and vegetables, such as citrus fruits and berries.Flavonoids can improve brain function and facilitate communication between brain cells.Therefore, drinking orange juice or eating citrus fruits can help improve attention in the classroom or at work.