Joel, a 15-Year-Old High School Sophomore, Sits in Front of His

Multiple Choice

Joel, a 15-year-old high school sophomore, sits in front of his computer eating "junk food" almost constantly when he is not sleeping or in school. How can Joel's behavior affect his weight?

A) His inactivity is positively related to weight gain.
B) His high caloric intake is positively related to weight gain.
C) His eating increases his metabolic rate, which is related to weight loss.
D) Both a and b, but not c, are behavioral factors that can affect his weight.