The study aims at determining if dietary phytoestrogens can be risk factors for Systemic Lupus Erythematosus (SLE). Dietary enquiry and phytoestrogens measurements will be performed in blood and urine of patients with SLE in an active phase of the disease, in patient with other autoimmune diseases and in healthy volunteers. Subjects will be premenopausal women and when possible at a define stage of the menstrual cycle. Free blood estradiol will be assayed as a confounding risk factor.
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Quantification of different isoflavones and enterolactone
Timeframe: At baseline (day 0)