Singer G.NA was diagnosed with being severely underweight.

During KBS 2TV "Vitamin," stars with great bodies appeared and had their body's age observed.

G.NA who they call 'mannequin body' and has a great body proportion along with a glamorous body line, shared that is 'like a mountain' to obtain her body.

G.NA stated, "I move around very much. I don't stay still for one moment. Even when I sit down, I move my ankles and move somehow. So when I sang ballads, I thought I was going crazy," and made people laugh.

However, her body's age came out to be 28 years old, which is 4 years older than her actual age (24).

A professional stated, "G.NA has low blood sugar and needs to gain at least 10.5kg. She needs to eat and not skip a meal, so that her low blood sugar won't appear."

G.NA stated, "Rather than eating a meal, I ate fried food, jelly, bread and junk food to fill my stomach, and it became a habit. Trying to stop that, I didn't eat too much."

Meanwhile Jang Woo Young, Yoon Hyung Bin, Jo Eun Sook, Sori all appeared on this show to share their tactics to achieve their bodies.