In a five-year study, University of Michigan researchers found that statins–drugs used to lower cholesterol–may cut the risk of dementia by half.

The exact reason why is not yet known, but statins improve blood flow to the brain (by reducing cholesterol-clogging in blood vessels) and reduce levels of insulin.

In another study by Boston University researchers, they found that angiotensin receptor blockers (ARBs)–drugs used to lower blood pressure–can prevent or delay dementia.

People taking ARBs were up to 40% less likely to develop dementia than those taking other blood pressure drugs and patients already suffering from dementia were less likely to get worse.

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