C: well, there are certain factors that effect people's size and weight.

　　A: what are they?

　　C: one study said that low-income groups have a higher percentage of over-weight people than higher income families.

　　A: why?

　　C: the survey said that the low, income groups eat more junk food on a daily basis.

　　A: that makes sense. Probably less time to make dinner and the junk food is cheaper.

　　C: and junk food contains lots of fat and oil. There is one final reason why so many people are fat.

　　A: what's that?

　　C: nobody exercises anymore-not even kids! The average american home has the TV on for 6 hours a day!

　　A: wow! No wonder people are so fat. Say, Carl, looks like you could be doing a bit more exercising.

　　C: yeah, I guess so.

　　A: you should consider eating healthier food and getting some more exercise.

　　C: hey, I started a diet and lost 10 pounds.

　　A: so what happened?

　　C: well, I quit and gained it back plus 5 pounds.

　　A: you should have kept trying.