weight adjustment causes a shift in hormones, because estrogen release is partially based on your fat cells.
Estrogen is the main reason the uterine lining builds up, and (lack of) progesterone is the main reason the uterine lining sheds.
Soy products contain estrogen-like compounds that your body processes much like its own estrogen. Intake of soy has varying effects on the women who consume it. Some find it helps their menstrual, infertility and menopausal conditions, while others find the opposite to be true
Weight loss or gain, also play into your menstrual cycle.
So it could be all or a combination of things.
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