Individual Effect of Diet on Postprandial Glycemic Response and Its Relationship with Gut Microbiome Profile in Healthy Subjects: Protocol for a Series of Randomized N-of-1 Trials
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 发起方
- 入组人数
- 80
- 试验地点
- 2
- 主要终点
- Fasting subcutaneous interstitial fluid glucose measured by continuous glucose monitor (CGM)
研究概览
简要总结
When all the food we eat is digested, it will increase blood glucose. Two people can have different glucose blood levels to the same food and one reason can be bacteria live in our gut. There are more than a thousand bacteria species in our gastrointestinal tract that have an important role in the proper functioning of our body, so our gut microbiome is a key piece for our nutrition and blood glucose control.
Nowadays, one of the major public health concerns is the rise of people with diabetes (a disease characterized by an increase in blood glucose) and the increase in obesity, in which one of several risks is diabetes. There are multiple reasons for people develop those diseases, however, some care on diet management can prevent, delay, or improve the effects of these illnesses. Therefore, this study proposes studying the blood glucose variation between healthy volunteers and if there is a relationship between that variation and the intestinal bacteria present. These results can help doctors and nutritionists elaborate a personalized diet for people who need blood glucose level control.
The investigators are recruiting volunteers aged 18 to 60, healthy, living at Florianopolis and the surroundings to participate in this crossover randomized N-of-1 study. The participants must collect fecal samples. After collection, the participants will meet the investigators and receive a kit containing ten standardized breakfasts, with two kinds of muffins, and a kit containing a glucose monitor (Abbott Freestyle Libre-CE marked) to monitor their blood sugar levels. The volunteers must have breakfast with the standardized meals and monitor the fasting glucose blood and postprandial glucose blood levels for ten consecutive days. Besides, they must take notes (like a diet diary) about all the food they ingest during the day in ten days of the study.
详细描述
Choice of design: The study is a N-of-1 randomized series trial with multiple crossovers.
Study population: This study will monitor healthy volunteers and they will be recruited via social media like Facebook, Instagram, and LinkedIn platforms.
Screening Assessment: The participants will be selected based on inclusion and exclusion criteria by study management researchers. Recruitment will be done via e-mail the participant will receive all the information about the study including the consent term and the anthropometric questionnaire. If he/she accepts it will be sent a collection kit for the fecal samples to the participant's address.
Study duration: Each participant will take part in the study for ten days. Dietary intervention: The participants will receive 10 standardized meals, divided into two kinds of muffins, which consist of a low-carbohydrate diet and a vegan one. The low-carb muffin will have a glycemic control characteristic, with a low carbohydrate content, below 45% of the carbohydrates recommended by the Acceptable Macronutrient Distribution Ranges (AMDR), while the vegan muffin will consist entirely of plant-based foods in the recommended macronutrient proportions. Both muffins will be similar in calories and standardized at 25% of daily calories, equivalent to the caloric distribution of breakfast.
After the fecal collection, the participant must introduce the standardized meals and the glucose monitoring device inserted. The meal order must obey the randomization established. Before breakfast, the participant will have to measure the fasting glucose with the monitoring glucose device and then eat the breakfast. After ingesting the muffin, the participant will measure glucose levels every 30 minutes over a 2-hour period, totaling four postprandial glucose measurements. Participants are free to eat whatever they wish at all other times, but they will report every meal in a diet diary. Together with breakfast, they can drink coffee without milk and sugar or water. The volunteers shouldn't do fasting exercises either for about two hours after breakfast.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 60 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •BMI > 18.5 and < 30
- •Willing to use an intradermal continuous glucose monitoring sensor during the 10-day study
- •Own a mobile phone with NFC technology
- •Willing to provide a fecal swab sample and a stool sample
- •Understanding, agreement, and signing of the approved Informed Consent Form (ICF) by the Ethics Committee (CEP)
排除标准
- •Pregnant or lactating women
- •Diagnosis of any gastrointestinal disorder or disease (Irritable Bowel Syndrome, Ulcerative Colitis, Crohn's Disease)
- •Intolerance or allergy to any diet ingredient
- •Autoimmune disorder (Lupus, Type 1 Diabetes, Celiac Disease) or infectious disease
- •Diabetes diagnosis
- •Cancer diagnosis, acute myocardial infarction, or stroke in the last 6 months
- •Use of hypoglycemic medication
- •Use of proton pump inhibitors, immunosuppressants, or antimicrobials in the last 3 months
- •Use of laxative medications in the last 30 days
- •Underwent invasive procedures or surgery in the last 6 months
- •Admission to ICU in the last 2 years
- •Participation in any experimental study or ingestion of any experimental drug within twelve months prior to the start of this study, in accordance with RDC 251/97
- •Inability to read and understand the informed consent form
结局指标
主要结局
Fasting subcutaneous interstitial fluid glucose measured by continuous glucose monitor (CGM)
时间窗: 0 min
All participants will measure fasting subcutaneous interstitial fluid glucose before breakfast with CGM device during 10 days of intervention. The device measures subcutaneous interstitial glucose in the mg/dL unit and the reading is done through the device's app by cell phone approximation. Data is retained in the app and will be shared with researchers.
Postprandial subcutaneous interstitial fluid glucose measured by continuous glucose monitor (CGM)
时间窗: 0 min
All participants will measure postprandial subcutaneous interstitial fluid glucose every 30 minutes over two hours after breakfast with CGM device during 10 days of intervention. The device measures subcutaneous interstitial glucose in the mg/dL unit and the reading is done through the device's app by cell phone approximation. Data is retained in the app and will be shared with researchers.
次要结局
- Participant's gut microbiome species richness(2 weeks)