The 24-year-old singer said in an interview that "it is not enough just to exercise if you aren't cutting back on your calorie intake."
"You can go from thin to skeleton-skinny," said IU.
"When I have something important coming up, I start drinking three liters of water daily for five days straight, which makes me go to the bathroom a lot," she explained.
"And on the seventh day, you are basically a skeleton," she emphasized, adding that "this way, you can go from thin to skeleton-skinny."
She once said on TV that she weighs 44 kg at 161 cm of height and shocked all with her 'double zero' to 'triple zero' size.
Some expressed concern, remarking that such extreme diet could be harmful to health.
By Gothesun and Arin Kim email@example.com