At the press conference of OnStyle Live's 'Channel AOA', AOA's ChoA revealed the reason behind her current diet. ChoA first admitted that she had gained weight, and the strongest motive behind her decision to go on a diet is was netizen's comment. 

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ChoA said, "A netizen said they wanted to starve me in one of the comments. Then I really realized that I need to go on a diet, so I started running on a running machine at home."

It seems like the negative comment was quite a shock for the idol.