Thyroid and cortisol are two major hormones in this area that cause weight gain and retention. (nuts-n-more-thespread.com)
The other major hormone involved during fasting is growth hormone. (pathtofatloss.com)
It is useful to obtain measurements of major hormones such as thyroid, cortisol, insulin, estrogen, testosterone and progesterone. (hawaiinaturopathicretreat.com)