Description

Participants with both prediabetes and obesity who undergo physical examinations at the Health Management Center of Nanjing First Hospital will be recruited for this study. The details of this study design are as follows:

1. Inclusion and exclusion criteria for participants. Inclusion criteria are as follows: 1) Age between 18 and 59 years old; 2) Body mass index (BMI) ≥ 28 kg/m2; 3) No consumption of coffee in the past month; 4) Provide written informed consent; 5) Abnormal glucose tolerance, as per the 1999 WHO diagnostic criteria for prediabetes, includes impaired fasting glucose (IFG), impaired glucose tolerance (IGT) or a combination of both, with blood glucose fluctuations within an abnormal range (fasting blood glucose ≥6.1 mmol/L but <7.0 mmol/L, and/or 2-hour glucose tolerance blood glucose ≥7.8 mmol/L but <11.1 mmol/L). The exclusion criteria for participants include individuals who 1) have been diagnosed with diabetes or are taking anti-diabetic drugs; 2) have a history of diseases such as cancer, liver and kidney dysfunction, existing cardiovascular and cerebrovascular diseases, and other diseases that may affect glucose and lipid metabolism; 3) self-report gastrointestinal reaction or intolerance to coffee and reject coffee consumption; 4) are pregnant or planning to become pregnant in the near future; 5) are deemed unsuitable to participate in this study by researcher believes that they are not to participate in this study.
2. Sample size calculation: Based on the estimation of research purpose, research design, expected effect size, and statistical analysis method, the sample size is determined to be 100 cases, including fifty cases in the intervention group and fifty cases in the control group.
3. Definition of the intervention group and placebo group: the intervention group serves as the coffee capsule group, and will receive 3.6 g of coffee capsules per day (0.3 g/capsule, 6 capsules/time, 2 times/day, once in the morning and once in the middle of the day). The placebo group (control group) is required to consume 3.6 g of cornstarch capsules per day (0.3 g/capsule, 6 capsules/time, 2 times/day, once in the morning and once in the middle of the day).
4. Follow-up and data collection: this follow-up period will span three months. Before and after the 3-month intervention the participants will partake in:
   1. regular assessments. Demographic characteristics and medical information will be collected, including age, gender, occupation, education level, income, medication history (hormones, contraceptives, etc.), and family history of chronic diseases. Besides, using questionnaires, we also collect lifestyle information such as smoking, drinking, diet intake, physical activity, and sleep of participants. Specifically, the Simplified Food Frequency Questionnaire (FFQ25) and 24-hour Diet Record Questionnaire (DR) are employed to assess the dietary intake of participants in the past six months and the previous 24 hours (one day each in the middle of the week and on the weekend), respectively. International Physical Activity Questionnaire (IPAQ) is utilized to assess various aspects of physical activity, including time, frequency, and intensity. The sleep information (sleep time, sleep quality, etc.) is evaluated by Pittsburgh sleep quality index (PSQI).
   2. A 75 g oral glucose tolerance test (75 g-OGTT). Blood samples are taken fasting and 30, 120 minutes after the glucose load. Blood samples are analyzed for glucose, insulin, C-peptide, and glucagon.
   3. 2-week continuous glucose measurement using blinded continuous glucose monitor/sensor on upper arm.
   4. Fasting blood samples: glycated hemoglobin (HbA1c), total cholesterol, high-density lipoprotein-cholesterol (HDL-C), low-density lipoprotein-cholesterol (LDL-C), triglycerides, high sensitivity C-reactive protein (CRP), interleukin 6 (IL-6).
   5. Furthermore, blood pressure, transient hepatic elastography for the assessment of fatty liver degree, body composition analysis, and heart rhythm variation analysis are collected using corresponding instrument and equipment inspection. Additionally, blood, urine, and stool samples will be collected for further analysis.