answer: #Person2# tells #Person1# that low-income groups have a higher percentage of overweight people than higher-income families because the low-income groups eat more junk food according to the survey. Besides, many people overweight because they do not exercise.
documents: #Person1#: Why are there still so many people overweight despite the current fitness craze?
  #Person2#: Well, there are certain factors that effect people's size and weight.
  #Person1#: What are they?
  #Person2#: One study said that low-income groups have a higher percentage of over-weight people than higher income families.
  #Person1#: Why?
  #Person2#: The survey said that the low, income groups eat more junk food on a daily basis.
  #Person1#: That makes sense. Probably less time to make dinner and the junk food is cheaper.
  #Person2#: And junk food contains lots of fat and oil. There is one final reason why so many people are fat.
  #Person1#: What's that?
  #Person2#: Nobody exercises any more-not even kids! The average American home has the TV on for 6 hours a day!
  #Person1#: Wow! No wonder people are so fat. Say, Carl, looks like you could be doing a bit more exercising.
  #Person2#: Yeah, I guess so.
  #Person1#: You should consider eating healthier food and getting some more exercise.
  #Person2#: Hey, I started a diet and lost 10 pounds.
  #Person1#: So what happened?
  #Person2#: Well, I quit and gained it back plus 5 pounds.
  #Person1#: You should have kept trying.