The document discusses whether fast food restaurants should be blamed for obesity in the U.S. It notes that research has found fast food portion sizes exceed guidelines and encourage overeating excess calories. Studies showed people who ate fast food once a month had the lowest obesity risk, while those eating it 3 or more times a week saw significantly higher obesity rates. The author chose to research this topic to inform people on weight issues that eating in moderation and portion control is important, rather than avoiding fast food altogether.