Coffee lovers know the first cup of the day can calm your nerves and make the world feel like a happier place. But the fourth, fifth, and six cups may be even more effective: They could protect you from developing multiple sclerosis (MS), an incurable autoimmune disease that attacks the nerves and affects your ability to move, according to a massive observational study recently released by the American Academy of Neurology.
Researchers compared coffee consumption of 1,629 Swedish people with MS and 2,807 healthy Swedes, plus 584 Americans with MS and 581 healthy Americans. Swedes who shunned coffee were 1.5 times more likely to develop MS symptoms than people who drank at least six cups of coffee a day. In the U.S., four cups a day worked the same magic: People who drank that much or more were also 1.5 times less likely to develop MS.
This article originally appeared on Cosmopolitan.com. Minor edits have been made by the Cosmo.ph editors.