Even without caffeine, dark roast coffee can still stop harmful clumps in the brain from forming—so it’s not the caffeine doing the job, but other chemicals created when the coffee is roasted.

Dark roast coffee seems to stop harmful clumps in the brain better than light roast coffee, and scientists think it’s because the darker roasting creates special compounds called phenylindanes.

Dark roast coffee seems to stop harmful clumps in the brain better than light roast coffee, and scientists think it’s because the darker roasting makes more of a special compound called phenylindane.

Dark roast coffee has a special compound that might stop two harmful proteins in the brain from clumping together, which could be good for brain health.

Even when there’s a lot more caffeine than the sticky proteins in the brain, it doesn’t stop those proteins from clumping together — so caffeine probably isn’t the main reason coffee might help prevent brain clumps.

Even when there’s a lot more caffeine than the sticky brain proteins involved in Alzheimer’s, caffeine doesn’t stop those proteins from clumping together — so something else in coffee must be doing the real work.