How old do you think this Korean blogger is?
Well, meet Jung Da Yeon, a housewife and mother of two.
And yes, she is 46 years old although she hardly looks like it.
In 2003, she lost 20kg in just three months by following a strict diet and exercise plan.
Following her dramatic weight loss, Ms Jung became famous after she published her diet books, workout videos, and photos online and in print, reports blog.dramafever.com.
She even had her own Nintendo Wii game released in Japan called 'Mom-chan Diet Wii: Figure-robics by Jung Da Yeon'.
She became known in South Korea as 'momjjang ajumma', which means 'mum with a striking figure'.
Asian housewives were motivated by Ms Jung's amazing transformation, and started working out too in a bid to achieve the momjjang look.
This trend became known as the momjjang syndrome.Images 1 to 24 show Jung Da Yeon, images 25 to 67 show Masako Mizutani, a 45-year-old housewife from Nagoya who looks like a 20-year-old.
The rest of the gallery features amazing transformations -- Singaporean Laura Patricia who inspired netizens with her dramatic 25kg weight loss, and an NUS undergrad, Angelina Tan, who lost 15kg after suffering a heartbreak.