BBC | TikTok users have told the BBC they think a viral tool which makes people appear overweight should be banned from the platform.
Known as a "chubby filter", the artificial intelligence (AI) tool takes a photo of a person and edits their appearance to look as though they have put on weight.
Many people have shared their before and after images on the platform with jokes about how different they look - however others say it is a form of "body shaming" and should not be permitted.
Experts have also warned the filter could fuel a "toxic diet culture" online and potentially contribute to eating disorders.
TikTok has not responded to a request for comment.
Sadie, who has 66,000 followers on TikTok, is one of those calling for the "mean" filter to be banned.
"It felt like girls being like, 'oh, I've won because I'm skinny and wouldn't it be the worst thing ever to be fat'," the 29-year-old from Bristol said.
She said she had been contacted by women who said they had deleted TikTok from their phones because the trend made them feel bad about themselves.
"I just don't feel like people should be ridiculed for their body just for opening an app," she said.
Dr Emma Beckett, a food and nutrition scientist, told the BBC she felt the trend was "a huge step backwards" in weight stigma.
"It's just the same old false stereotypes and tropes about people in larger bodies being lazy and flawed, and something to be desperately avoided," she said.
She warned that could have a broad social effect.
"The fear of weight gain contributes to eating disorders and body dissatisfaction, it fuels toxic diet culture, making people obsess over food and exercise in unhealthy ways and opening them up to scam products and fad diets.
"And it pressures everyone to conform to narrow beauty and health standards, rather than finding what works best for their own body - that causes harm to everyone, both in physical and mental health."
Testing the 'chubby filter'
By Jessica Sherwood, BBC Social News
Filters - which use AI to manipulate a person's appearance - are common on TikTok.
Many are harmless - for example one popular trend makes it appear as if a person was made out of Lego.
They are often designed by individuals with no link to TikTok - as appears to be the case with the new "chubby filter".
Some of the most popular videos using the filter have been liked tens of thousands of times.
For the purpose of this article, I used the filter on myself.
I felt incredibly uncomfortable.
As someone who is very body positive and has struggled with their self-image in the past, using it couldn't be further away from how I personally use social media and I was unhappy that TikTok pushed it to me in the first place.