A Fred Hutchinson Cancer Research Center study involving postmenopausal, overweight, and obese women who took 2,000 IUs of vitamin D daily for a year found that those whose vitamin D blood levels increased the most had the greatest reductions in blood estrogens.
Scientists believe that obese and overweight people have lower levels of vitamin D because the nutrient is stored in fat deposits. A prevailing theory is that during weight loss, the vitamin D trapped in fat tissue is released into the blood and becomes available throughout the body.
I never realized that vitamin D levels influence estrogen levels.