Nina said she was happy to see people criticising the trend, which she called "immoral and insensitive".
"We should be lifting each other up, not shaming each other's bodies," she said.
Sadie agreed that it should not be allowed - however, she felt there might be other things TikTok could do.
"Maybe it should have a warning," she said.
"If there's themes of body shaming or an eating disorder or anything like that, I think there should be a way of flagging it where, if these people want to post it, they post it, but it doesn't get pushed to a wider audience."