Final answer:
The heart-healthy nutrient is magnesium, which supports cardiovascular function and helps regulate heart contractions and blood pressure.
Step-by-step explanation:
The nutrient that is heart healthy is magnesium. Magnesium is essential for maintaining a healthy heart rhythm and blood pressure, as well as supporting overall cardiovascular function. It helps regulate heart contractions and relaxes blood vessels, reducing the risk of heart disease and hypertension. Good food sources of magnesium include spinach, nuts, seeds, and whole grains.
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