Four potentially life-saving numbers that people should know are their blood pressure, cholesterol, fasting blood sugar and hemoglobin A1c, and waist-to-hip ratio, registered dietitian Bonnie Taub-Dix writes. She notes that heart rate, BMI and body weight are not as important to know, but that tracking the others over time "could make the difference between whether you'll prevent disease or need to treat it."

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