You drink diet soda instead of sugary beverages
Unfortunately, the sugar-free "diet" options aren't much better than their sugar-filled counterparts. Diet drinks probably won't help you lose weight, and they could also do damage to your heart: A study shows that women who drink two or more diet sodas a day have a major increase in heart disease and deaths. Water, unsweetened tea, green juice, and black coffee should be on your list.
You skip medical checkups and don't get advanced lab work
You may be young and "invincible" now, but not even a healthy lifestyle can make you totally immune to heart disease. While lifestyle factors like diet, smoking, and exercise play the biggest roles in heart health, there are genetic factors that are an important minority.
See a health care provider to check your blood pressure, EKG for your QT interval, and lab work for fasting glucose, vitamin D level, cholesterol panel, lipoprotein a and homocysteine measurements, and an assessment of inflammation by a test called hd-CRP. If you're over 40 with risks for heart disease, get a coronary artery calcium scan and know your score. You may have an underlying condition that could affect heart health, and knowing where you stand can help inform the other lifestyle choices associated with heart health.