- A survey was conducted in Ho Chi Minh City, Vietnam on fast food eating behaviors and brand preferences among 476 respondents aged 18-39. - 71% of respondents liked or liked very much fast food. 47% were regular fast food users, with higher rates among males and youth. Hanging out with friends was the most common occasion for eating fast food. - The most frequently used fast food brands were KFC and Lotteria. KFC and Lotteria were seen as having good prices, locations, and promotions, while McDonald's was associated with higher prices.