Coffee may energise morning drinkers. According to a new study in Annals of Internal Medicine, coffee consumers are less likely to die over a 7-year follow-up period.

Adults who consumed 1.5 to 3.5 cups of unsweetened or sugared coffee each day were less likely to die. Artificial sweeteners muddled the study's conclusions, the authors stated.

Author Dr. Dan Liu said, "Our study found that persons who drank modest volumes of coffee sweetened with sugar every day were roughly 30% less likely to die from any cause during the average seven-year follow-up period."

Previous studies revealed that coffee intake is linked to a lower risk of death, but they didn't differentiate between coffee drinkers who used sugar or artificial sweeteners.

Researchers used the U.K. Biobank health behaviour questionnaire. Researchers interviewed more than 171,000 people without heart disease or cancer about their food and health to estimate coffee intake.

During a 7-year follow-up period, coffee drinkers were 16 to 21% less likely to die than non-drinkers.

According to the study, participants who consumed 1.5 to 3.5 daily cups of coffee with 1 teaspoon of sugar each cup were 29 to 31% less likely to die. Artificial sweetener users were inconclusive.

The study authors emphasised that while most coffee lovers may not have to give up the beverage, they should be wary of higher-calorie speciality coffees.

The average amount of daily sugar per cup of coffee included in the study analysis is substantially lower than the amount found in specialty beverages at popular coffee chain restaurants, the announcement added.