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A randomized trial published May 14, 2022, in The Lancet found that people with heart disease who ate a Mediterranean diet for seven years had a 26% lower risk of having a heart attack or stroke, compared with people who ate a low-fat diet.

Seven factors appear to account for most first heart attacks in people ages 55 and younger: diabetes, depression, high blood pressure, current smoking, family history of early heart attack, low household income, and high cholesterol.

For people with heart disease, a Mediterranean diet prevents future heart problems better than a low-fat diet.

Grief, fear, conflict, or other negative emotions can lead to an unusual type of heart attack, commonly known as broken heart syndrome. Rarely, positive emotions can also trigger the problem—and this "happy heart syndrome" may be more prevalent among men.

Not getting sufficient sleep may harm the cardiovascular system by triggering physiological and hormonal changes that increase blood pressure, blood sugar, and blood levels of substances that indicate inflammation. People who don't regularly get at least seven hours of sleep a night should assess their daily habits to look for ways to improve, such as by establishing an earlier bedtime and turning off all electronic devices at least an hour before bedtime.

Recent guidelines suggest a blood pressure reading of less than 120/80 mm Hg as normal. But the ideal number for individuals depends on their individual goals and whether they also have a chronic condition, such as heart disease or kidney disease.

A 2022 study found that people who have depression after a heart attack are nearly 50% more likely to suffer a stroke compared with heart attack survivors who don't develop depression.

High temperatures raise risk for heat exhaustion and heat stroke, and also stress the cardiovascular system, making the heart work harder. If you have a heart condition, here's how to keep cool and protect yourself when temperatures rise.

In a study published online Feb. 14, 2022, by the journal Heart, people ages 65 or older who exercised at least 20 minutes per day—especially men ages 70 to 75—had fewer heart attacks and a lower risk of premature death, compared with people who didn't exercise.

Acute coronary syndrome (ACS) refers to a spectrum of conditions defined by a sudden reduction in blood flow to the heart. Most often, the underlying cause is a gradual buildup of fatty deposits called plaque inside the arteries supplying the heart. ACS includes two distinct types of heart attacks, known as STEMI and NSTEMI, and a serious condition called unstable angina that's often a prelude to a heart attack. All warrant immediate medical attention.