Previous researches of slimming advertising are mainly focused on the construction of female body images and myths. This research focuses instead on the examination of slimming advertising. This research concludes that the third person effect is suitable for the research of slimming advertising. "The social distance hypothesis" proposed in this research is not supported by the evidence shown in the survey result. The result shows that not only men are more likely to think that slimming advertisement has produced greater effects on their female counterparts, but women are also having the same thoughts, even more so. This research has made an interesting finding by pointing out that the degree of involvement in certain conditions may lead to "reversed third person effect".