Milk for Diabetes Prevention

Inclusion Criteria: * LNP genotype (LCT gene rs4988235, GG genotype) * History of pre-diabetes, defined as fasting blood glucose 100-125 mg/dL and/or hemoglobin A1c (HbA1c) 5.7-6.4% and have not been diagnosed with diabetes nor take diabetes medication (pre-diabetes determined at most recent study visit \[for HCHS/SOL participant\] or most recent medical chart or self-report \[for other participant\]) * Drink ≤1 cup milk/day * Basic computer or smartphone skills * Can speak and read English fluently Exclusion Criteria: * Diabetes diagnosis * Taking anti-diabetes medication * Cancer, cardiovascular disease (CVD), or life-threatening illness * Known milk allergy * Has severe GI symptoms after drinking milk * History of GI surgery * Had a double mastectomy * Smoking * More than 1 alcoholic beverage/day * Pregnant or breastfeeding * Colonoscopy in last 2 weeks * Antibiotics in last 3 months * Taking probiotics or fiber supplements (if taking, must be able to stop taking during study) * Taking laxatives, stool softeners, anti-diarrheal (if taking, must be able to stop taking during study) * Taking lactase pills (if taking, must be able to stop taking) * Participating in extreme dieting program * Planning extended travel that would prevent participation in study * Taking medication that must be taken separate from calcium or dairy products