Yogurt and GI Health

Inclusion Criteria: * Age 50 - 75 years * BMI 18.5 - 39.9 kg/m2 Exclusion Criteria: * BMI less than 18.5 or greater than 39.9 * Consumption of fermented foods or probiotics in the past two weeks * Unwillingness to abstain from non-study fermented foods and probiotics during the trial * Allergy to cow milk * Lactose intolerance * Any dietary restriction limiting or prohibiting consumption of lightly sweetened, vanilla flavored, whole milk yogurt * Uncomfortable with or unwilling to complete stool sample collections * Current participation in another research study * If female, * Currently pregnant or lactating * Have had menstrual bleeding in the past 12 months * Having fewer than 3 bowel movements per week * Unmanaged hypertension, defined as blood pressure greater than or equal to 140/90 mmHg * Current diagnosis of: * Disease that affects the immune system, including HIV/AIDS * Cancer * Diabetes * Asthma with daily medication * Primary immune deficiency * Auto-immune disease * Chronic gastrointestinal disorder (e.g. Crohn's disease, irritable bowel syndrome, colitis, gastric ulcer) * Current use for 2 weeks or longer of: * Any drug that affects the immune system, such as immunosuppressants, immune modifying drugs, or corticosteroids (e.g. cortisone, prednisone, methylprednisolone) * Biologics (e.g. Lantus, Remicade, Rituxan, Humira, Herceptin, Avastin, Lucentis, Enbrel) * Use of sulfonamides or antibiotics in the past 3 months * Use of laxatives i…