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University Hospital, Bordeaux, is conducting a non-randomized diet-based study on patients who have systemic lupus erythematosus (SLE) to establish what role (if any) phytoestrogens play in the etiology of SLE and flare-ups of SLE. The study is an observational, monocentric, preliminary study aiming at determining if estrogenic isoflavones can be risk factors for SLE. The intervention will be the collection of extra blood and urine samples on SLE subjects and on autoimmune and healthy counterparts.