Yes, D is fat-soluble, so it won't increase much in serum levels until the fat is saturated with it. But your criticism doesn't necessarily check out as the av

Yes, D is fat-soluble, so it won't increase much in serum levels until the fat is saturated with it. But your criticism doesn't necessarily check out as the average BMI of group B was actually lower than that of group A. See page 4 of the PDF [1]. [1]: https://www.nature.com/articles/s41598-020-77093-z.pdf https://www.nature.com/articles/s41598-020-77093-z.pdf