Full-fat Yogurt and Glucose Tolerance

Inclusion Criteria: * Men and women and not expecting major lifestyle changes while on study * Age 45-75 * Overweight and obesity (BMI 20-45 kg/m2) * Stable body weight for the last 6 months (no more than a +/- 5% change) * Diagnosis of prediabetes, defined as either impaired fasting glucose (fasting glucose: 100-125 mg/dL), impaired glucose tolerance (blood glucose levels of between: 140-199 mg/dL 2-hr post 75-g oral glucose tolerance test), and/or a hemoglobin A1C (HbA1C) level ranging from 5.7% to 7.0% (if HbA1C above 6.4%, monotherapy of Metformin) * Women: Post-Menopausal: no menses previous 12 mos.; Follicular Stimulating Hormone (FSH) \> 20 mIU/mL * Consuming at least 25% of calories from fat (screening will be based an online fat screener: http://nutritionquest.com/wellness/free-assessment-tools-for-individuals/fat-intake-screener/ * Normal cognition * Read and understand English * Have a telephone * Willing to follow the study coordinator's/manager's and dietitian's instructions Exclusion Criteria: * Fasting blood glucose ≥126 mg/dL, HbA1C ≥7.0% without monotheraoy of Metformin * Subject with any chronic disease, inflammatory disease (e.g., asthma, rheumatoid arthritis, Crohn's disease or inflammatory bowel disease) and previous diagnosis of HIV or hepatitis C * Pregnant or breastfeeding women or women on hormone replacement therapy (for previous 3 months) * Intolerance to dairy foods (i.e., lactose intolerance or protein allergy), food allergies, or significant…