additional calories to perform its basic functions and the activities in which you participate. Activity Level Calories Needed Sedentary (little or no exercise, desk job) 1.2 times BMR Lightly active (light exercise/sports 1–3 days/week) 1.375 times BMR Moderately active (moderate exercise/sports 3–5 days/week) 1.55 times BMR Very active (hard exercise/sports 6–7 days/week) 1.725 times BMR Extra active (hard daily exercise/ sports and physical job or training for a marathon) 1.9 times BMR What activity level describes your lifestyle? Calculate the number of calories you need to consume for your body to sustain this activity level and to maintain your current weight. 4. If you want to lose weight, you must take in fewer calories than what you found in Step 3. One pound of body fat is equal to 3500 cal. So, if you want to lose 1 lb in a week, you will need to decrease your intake by 3500 cal or by an average of 500 cal per day. If you want to lose 2 lb in a week, you will need to decrease your intake by 1000 cal per day. Assume you want to lose 1 lb a week, how many calories should you consume each day? 5. In addition to decreasing caloric intake, you can also increase your physical activity to burn off additional calories. List a number of physical activities you do during a week, such as walking, jogging, or climbing stairs. 6. Research the Internet to find estimates for the number of calories you burn per minute for each of these activities. 7. Develop an expression for the estimated number of calories you burn doing each of these activities in a week, using a variable for the number of minutes you do each activity. 8. Evaluate the expression you found in Step 3 to determine the amount of calories burned by engaging in these activities for 30 min, 1 hr, 2 hr, 3 hr, 4 hr, 5 hr, and 6 hr per week. 9. How long would you have to engage in these activities to burn 3500 cal in a week? 84 Chapter 1 Real Numbers and Algebraic Expressions
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