General Protocol: Both dietary studies (Study 1 fiber plus polyfructans; and Study 2 soy plus polyfructans) will follow the same general protocol. Supplements and measurements will differ between studies. Diets will be self-selected low-fat diets throughout (<7% of total energy as saturated fat and, <200 mg/d dietary cholesterol). Supplements will be provided at weekly intervals. At the start and at two weekly intervals during the study body weight, blood pressure and fasting bloods will be taken together with 24h urine and 4-day fecal collections and samples for fecal microbiology to be obtained during week 4. Treatments: Both studies will involve a control diet which will be an NCEP step 2 diet (low in saturated fat and dietary cholesterol) with 10-20 g inulin. Study 1 subjects will take 10-15 g viscous fiber foods with or without the fructan. Study 2 subjects will take 30-40 g soy protein foods with or without the fructan (please see Table 1). The supplements will be provided as foods: oat bran bread to be taken with meals and as snacks during Study 1 and soy protein to be taken in soy beverage, soy hot dogs, burgers, tofu, etc., during Study 2.