This claim is not true, rather it is something that can only be determined by Ariana grande or a healthcare provider.
The source of this post is The London Evening Standard which is a UK-based newspaper formatted in a tabloid-like manner, making it less credible from the start. The news outlet covers a wide range of topics including news, sports, business, lifestyle, culture, going out, homes and property and opinion pieces. It doesn’t seem to have any left or right-leaning bias, but it does have the intention of utilizing dramatic headlines and language within their articles to attract an audience.
What I find interesting is that it is owned by a Russian and son of a former KGB officer, Evgeny Lebedev. That may be the reasoning for its investigative and tabloid-like nature for news delivery. Also, he has had a history with not caring about his women journalists' needs and support due to prioritizing business needs. He did this by cutting off salaries of women journalists on maternity leave since the newspaper’s financial needs were not being met. This lack of respect of women certainly shows this bias in the article linked here.
Other coverage that I found are largely from other gossip-like outlets like Daily mail, Atlanta Black Star, and Newsweek. These outlets are actually assuming that she does have an eating disorder. They use dramatic and demeaning wording like “painfully thin” and "looking extreme” to describe her since her red carpet for the movie Wicked. They gave no evidence of an actual statement from Arianna or a healthcare statement released. On the other hand, USA Today doesn't outright admit or claim that Arianna Grande has an eating disorder, rather they focus on how the negative body-image comments are damaging and how celebrities are entitled to the same respect as anyone else. They do quote Arianna Grande from 2023 stating “you never know what someone is going through” along with “there are many different ways to look healthy and beautiful.” This shows the outlet is trying to build up compassion and acknowledging multiple perspectives on the issue. This I find to be a more understanding and unbiased approach to Arianna’s situation—whatever that may be.
Within the actual article of The Standard, they use a very opinion-loaded statement to grab the audience’s attention :“When the American singer and British actress were cast in 2022, they were already Hollywood-thin – now you can see the outlines of their skulls through their hollow cheeks and sunken eyes. We should be concerned for them.”(Block 2024). Their use of overexaggerated adjectives and that they are suggesting that she may have an eating disorder (not supportive of the claim) are things that make the claim that Ariana Grande doesn’t have an eating disorder false and not supported by substantial evidence. The title of the article “Wicked stars Ariana Grande and Cynthia Erivo look scarily thin – and it makes me uncomfortable” also disputes the claim that Arianna Grande does not have an eating disorder.
All in all, the claim does not match up with the source’s point of view on the issue and there is no way to realistically determine the condition that someone may be experiencing unless a statement is released from them.
Sources
https://www.telegraph.co.uk/business/2024/08/09/evening-standard-lord-lebedev-accused-closing-news-on-cheap/
https://www.usatoday.com/story/life/health-wellness/2024/11/21/ariana-grande-cynthia-erivo-wicked-bodies/76463422007/
https://atlantablackstar.com/2024/11/13/wicked-co-stars-ariana-grande-and-cynthia-erivos-shockingly-thin-appearance/
https://www.dailymail.co.uk/tvshowbiz/article-14070859/ariana-grande-weight-loss-wicked-premiere.html