Diabetes Mellitus, Type 2 Clinical Trial
Official title:
Prediabetes Stratification by Multi-omics Profile After Food Intake
1 in 3 adults have prediabetes in the United States, and many of them will eventually develop diabetes, which has significant public health and economic costs. However, type 2 diabetes (T2D) and prediabetes are heterogeneous groups with different pathological mechanisms, dysfunctions in different processes, and varied disease trajectories. Patient stratifications into subtypes and personalized nutrition interventions are highly needed but not yet available. Metabolic responses (e.g., glucose excursion) after food intake provide a direct observation of personal metabolic control and its association with T2D. The investigators hope to learn how prediabetes and type 2 diabetes evolve, and specifically what food or exercise can do to mitigate blood sugar response.
Screening: The investigators will check fasting blood sugars, HbA1C to determine status (healthy, prediabetes or diabetes). Enrolled participants will be provided with a Continuous Glucose Monitor (CGM) to measure blood sugars for 10 days and a Fitbit fitness tracker. They will then follow the instructions for each of the 10 days on the monitors: Day 0: participants will start using the devices and start recording food intake in a food logging app (Cronometer) Day 1-6: Participants will eat a provided portion of white rice (50g of carbohydrates) within 1.5 hrs of waking up). Day 1,3, 5 consume one of the mitigator foods provided (fat (cream), protein (egg whites), or fiber (powdered pea fiber)). Days 2 and 4 no mitigators will be consumed. Day 6 the investigators will ask participants to exercise before eating the rice. Exercise will be moderate for 20 min with constant heart rate level about (220-age)*0.7. During these 6 days participants will be asked to collect microsamples of blood using the Tasso device on the following time points: right after waking up; right before eating their rice; 30 minutes, 1, 2 and 3 hours after the start of the rice meal; right before going to bed Days 7-9 no intervention, just continue to use devices and log food intake. Optional- 5 participants who volunteer to repeat this 10 day cycle 3 times. Optional metabolic tests: 1. Oral Glucose Tolerance Test (OGTT) to measure glucose tolerance and beta cell function: participants will be provided with a 75g glucose solution to drink and collect samples at 10-30min intervals for 180 minutes. 2. Undergo an insulin sensitivity test (Steady State Plasma Glucose, SSPG)- glucose, insulin and ocreotide infusions will be provided and blood samples taken at 10-30min intervals for 240 min. 3. Undergo an Isoglycemic Intravenous Glucose Infusion test (IIGI) to test for incretin hormone function- a glucose infusion will be given and blood samples collected at 10-30 min intervals for 180 min. ;
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