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While doing research on the modulation of chemosensory pathways by diet, we found evidence to suggest the taste worlds of male and female mice were quite different and that sex was playing an important role in how mice responded to dietary challenges.  While the chemosensory field has largely concentrated on elucidation of signaling pathways in male mice for practical reasons, these data suggest that a new focus on the role of sex in taste is warranted.  Currently, we are exploring the effects of sex on taste pathways that underlie of sense of fat and sweet taste and how these pathways are regulated by diet in female and male mice.  In addition, we are beginning to identify the role of sex hormones (estrogen, testosterone, ...) in nutrient recognition, dietary self selection and nutrient related disorders.