Take half an aspirin daily.
Yes, those big studies came out last year saying low-dose aspirin does pretty much zilch to prevent heart attacks and cancer in women, but we still have little bits and pieces of the puzzle coming in—and the evidence is strong for aspirin's reducing the risk of stroke. Let's put it this way: People in the know take half an aspirin a day. If you're over 40, we recommend half a 325 milligram tablet (or two baby aspirins), with half a glass of warm water both before and after you swallow so that you're less likely to irritate your stomach. Check with your doctor to make sure you are aspirin tolerant.