The WHO is delayed a little because they are such a large organization and have to be very careful with what they say.
Additionally, nutritional needs for fat soluble vitamins is supported by WHO, they have multiple PDFs about this that are hundreds of pages long. I don't like linking PDFs but you can Google.
The WHO takes all the studies I've given you already, and then decides how to publish to communicate with the public and the world. Why they choose to publish what they do - how tf would I know? I don't work for them. There is tons of evidence and studies globally for nearly, again, a century now that support this. Idk, try critically thinking and don't have things spoonfed to you, you're an adult, right?
Look, here's Cambridge asserting the same thing, surely you wouldn't dismiss Cambridge just because you have fat phobia issues, right? https://www.cambridge.org/core/journals/journal-of-developmental-origins-of-health-and-disease/article/abs/association-between-vitamin-levels-and-obesity-in-the-national-health-and-nutrition-examination-surveys-2017-to-2018/0D0A4769ACC80225E5DEC568B1C88884
Here's another study showing DDT causes obesity: https://pmc.ncbi.nlm.nih.gov/articles/PMC5915185/
You are welcome to Google all the other toxins listed plus the word obesity to learn more. I think you need the research practice, curiosity, and to stop being spoonfed, so I won't do it for you. Cmon, learn, you can do it kiddo. Let go of your eating disorder and self hatred and learn