Very off topic (but no other way to send you a note).

There's been some interesting things going on with the vitamin D receptor and white vs brown fat. Thought you might find it worth an article.

https://pubmed.ncbi.nlm.nih.gov/26488808/

Note for anyone else reading this: they have NOT found that taking (or not taking) vitamin D has any effect on this - it's an additional thing the Vit D receptors are involved with.

In defense of my interruption here, this article is about high-fat diets, and my note is about fat cells.