That sounds like a better idea. I've seen a couple claims that higher vitamin-D levels go with lower weight, e.g. https://www.fredhutch.org/en/news/releases/201

That sounds like a better idea. I've seen a couple claims that higher vitamin-D levels go with lower weight, e.g. https://www.fredhutch.org/en/news/releases/2014/04/vitamin-d-effect-on-weight-loss.html https://www.fredhutch.org/en/news/releases/2014/04/vitamin-d...