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.

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 a lot of coffee or consume a lot of caffeine seem to have better memory and slower brain decline as they age, according to studies that watch people over time — so coffee might help keep your brain sharp without costing much.

People who drink more tea tend to have a slightly lower chance of getting dementia — every extra cup a day might lower the risk by about 4%.

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.