Non-Nutritive Sweetener Consumption and Glucose Homeostasis in Older Adults With Prediabetes

Inclusion Criteria: * Age 40+ years * Prediabetic (fasting glucose concentration of 100-125 mg/dL, 2-hour oral glucose tolerance test glucose concentration of 140-199 mg/dL, or a HbA1c value of 5.7% to 6.4%) * Weight stable for previous 6 months (±2 kg) * BMI \<40 kg/m2 * Sedentary to recreationally active * No plans to gain/lose weight or change physical activity level * Willing to pick up food daily and consume foods provided for an 8-week period * Verbal and written informed consent * Approval by Medical Director * Consume less than one serving of non-nutritive sweetener per week Exclusion Criteria: * BMI \>40 kg/m2 * Diabetes or diabetes medication * Antibiotic, prebiotic or prebiotic use in prior 3 months * Uncontrolled hypertension (blood pressure (BP) \> 159/99 mmHg) * Diagnosed inflammatory bowel disease * Past or current heart diseases, stroke, respiratory disease, endocrine or metabolic disease, or hematological-oncological disease * Vegetarian or vegan * Pregnant or plans to become pregnant * Breastfeeding * Food allergies or aversions, Phenylketonuria (PKU) * Estrogen or testosterone usage