If you are already keeping an eye on phytoestrogen intake, most likely the high estrogen levels you had in your test results are a result of being overweight. Excess body fat in fat cells leads to increased estrogen production.
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The best way to lower your estrogen levels back to normal levels would be to lose weight, particularly via exercise, as this will also reduce cortisol. Research has shown that exercise alone, even independent of weight loss, can reduce free estrogen levels in overweight women.