What does research suggest about regular physical activity's effect on the life span? A. Consuming a healthful diet while engaging in regular physical activity can reduce oxidative stress without the need for Calories B. People genetically predisposed toward a lean body type live longer even if they eat poorly and fail to engage in regular physical activity  C. Excercise increases the risk for osteoporosis and fractures, reducing life span D. To prolong life span, physical activity must be performed at least four times a week in sessions lasting at least 45 minutes

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