A. It is difficult to say from history you provided if this is perimenopause but it could be that or several other things as well. Having a blood test for FSH can help because that hormone starts to go up as one approaches menopause. However, other conditions such as abnormal thyroid hormones (tested by checking the blood test TSH and T4), weight gain or loss, stress, excessive exercising or dietary changes are common other causes. Talk to your doctor about having these things evaluated.
Soy milk is overall a great beverage and should not affect your menstrual cycle. But it does contain week plant estrogens that are called phytoestrogens. Isoflavones are the phytoestrogens that are typically listed on soy milk products. Look at the box and see how many isoflavones are in each box of soy milk and try to limit your intake to less than 100 mg daily or ideally about 50 mg of isoflavones daily. Typically, a few glasses daily is a good amount to consume.
If you are planning to have children and that is possible for you to do at this time, it is a good idea to begin your family because after age 35 is can take a little longer to conceive.
Machelle M. Seibel, MD