The line graph compares the body weight of two men, Bob and John, between 2008 and 2013, while the accompanying tables provide information about their weekly exercise hours, daily calorie intake, and television viewing time over the same period.
Overall, Bob experienced a steady decline in weight throughout the six years, whereas John showed a clear upward trend. Notably, both men weighed the same in 2011, after which their weight patterns diverged considerably. Changes in diet and lifestyle appear closely linked to these contrasting trends.
In 2008, Bob was the heavier of the two, weighing approximately 250 pounds, compared with John at around 190 pounds. Bob’s weight then decreased consistently, dropping to about 230 pounds in 2009 and 220 pounds in 2010, before reaching 200 pounds in 2011. This downward movement continued, with Bob ending the period at roughly 180 pounds in 2013. In contrast, John’s weight remained stable at 190 pounds until 2009, rose to 200 pounds in 2010, and reached 200 pounds again in 2011. After that, his weight climbed sharply, reaching approximately 220 pounds in 2012 and peaking at 240 pounds by 2013.
Turning to lifestyle factors, Bob increased his exercise from 0 hours per week in 2008 to 15 hours in 2009 and 2010, then to 20 hours in 2011 and 2012. During the same time, his daily diet decreased significantly from 15,000 kJ in 2008 to 10,000 kJ between 2010 and 2012, before falling further to 9,000 kJ in 2013. His television viewing was reduced from 30 hours per week in 2008 to 10 hours for most of the period, though it rose again to 30 hours in 2013.
John’s pattern was almost the reverse. Although he exercised 10 hours per week from 2009 to 2011 and increased this to 20 hours in 2012, his calorie intake rose steadily from 10,000 kJ in 2008 to 18,000 kJ in 2012. In 2013, despite cutting exercise back to 0 hours, his diet remained high at 15,000 kJ, while his television viewing increased sharply to 30 hours, coinciding with his highest recorded weight.