This study is designed as a prospective cohort study to evaluate the potential of diagnostic procedures in defining populations of patients self-reporting unexpected and uncontrollable episodes of body odor and/or halitosis. Our initial cohort is generally healthy individuals who already underwent multiple diagnostic tests recommended by their physicians and have not been diagnosed with any known condition. The investigators will analyze results of gastrointestinal and nutritional diagnostic tests offered by Biolab Medical Unit to determine if these tests are useful as potential screening tools for metabolic body odor and halitosis.