Drinking caffeine doesn’t seem to make you more or less likely to get dementia — people who drink the most caffeine had a tiny bit lower risk, but it’s not enough to be sure it’s real.

People who drink a moderate amount of coffee or tea may be less likely to develop dementia later in life — about 18% less likely, according to this claim.

People who drink more coffee or caffeine-rich drinks tend to forget things less quickly as they get older, and this might mean caffeine helps slow down memory problems linked to Alzheimer’s.

People who drink 1 to 3 cups of coffee a day might have the lowest chance of getting dementia, according to studies of hundreds of thousands of adults — but drinking more or less than that doesn’t seem to help as much.

People who drink a lot of coffee or tea—more than 300 mg of caffeine a day—might see their memory problems from Alzheimer’s slow down more than people who drink very little caffeine, based on studies that track groups over time.

Scientists aren’t sure if drinking tea, coffee, or caffeine affects your risk of dementia or Alzheimer’s — the evidence is too weak to say for sure.