Final answer:
One key behavior for sustained weight loss identified by the NWCR is regular physical activity, which is often a component of successful weight loss programs that also include self-monitoring and nutrition education.
Step-by-step explanation:
One of the top behaviors associated with sustained weight loss, as identified by the National Weight Control Registry (NWCR), is regular physical activity. The NWCR has found that individuals who were successful in sustaining weight loss typically engaged in consistent physical activity, often including walking as a form of exercise. Regular physical activity, coupled with dietary modifications, such as adhering to a low-calorie, low-fat diet, has been shown to be effective. Moreover, successful weight loss programs often include supportive behavioral interventions like self-monitoring of food intake and exercise, setting physical activity goals, and participating in nutrition education.