View clinical trials related to Diet Therapy.
Filter by:Persons with Type 2 Diabetes (T2D) are at an increased risk of cardiovascular disease (CVD) and mortality. Dietary changes are recommended by guidelines to treat T2D and reduce risk of CVD. Plant-based diets eliminate certain (i.e. vegetarian diet) or eliminate all animal based products (i.e. vegan diet). Clinical trials with plant-based diets have not looked at incidence of CVD as a (primary) outcome, but at intermediate outcomes of cardiovascular risk. A meta-analysis of 8 trials including 369 persons with T2D found an effect of a plant-based diet on glycated hemoglobin (HbA1c) of -0.29% [95% CI: -0.45, -0.12%] relative to mostly (omnivorous) low-fat diets or usual diet. The 95%CI ranged from what the authors had defined as clinically trivial to clinically relevant. For lipids, a network meta-analysis in persons with T2D compared the effect of a plant-based diet to a (omnivorous) low fat diet (274 patients allocated to a plant-based diet vs 2047 patients allocated to low fat diets). Compared to omnivorous low fat diets, the mean effect of plant-based diets on LDL-Cholesterol was -0.33 mmol/L [95%CI:- 0.55, - 0.12]. However, the quality of the evidence for this estimate was graded as low, mainly due to imprecision and within-study-bias. Furthermore, plant-based diets might reduce blood pressure (BP). However, while vegetarian diets reduce BP in patients with and without hypertension, for vegan diets the effect was only significant in patients with a systolic BP>130mmHgz (see section 1.4.3). Additionally, the effect of plant-based diets on inflammation, which might also be causally related to CVD risk in persons with T2D, has not been reported in trials with persons with T2D. Furthermore, most clinical trials of plant-based diets in persons with T2D have used resource intensive interventions, like weekly group meetings and cooking sessions. The effect of an online plant-based dietary intervention, which is more scalable, has not been reported in clinical trials. Lastly, factors influencing adherence in these trials have not been reported. In summary, plant-based diets likely lower CVD risk by lowering HbA1c, LDL cholesterol and potentially blood pressure in persons with T2D. However, estimated effect sizes are imprecise and the effect on inflammation is still unknown. Furthermore, trials to date have used resource intensive interventions. Thus, the present trial aims to study the effect of a primarily online plant-based dietary program on (cardio)vascular risk factors in persons with T2D. Additionally, adherence and factors influencing adherence will be investigated. Participants will be randomized to the intervention or control group. The intervention group will be guided to transition to a plant-based dietary pattern using an online platform and online sessions. Researchers will compare the intervention group to the control group, that continues with usual diet, to see if the cardiovascular risk profile of the intervention group improves.
Background: Trillions of tiny organisms-including bacteria, fungi, and viruses-live inside our intestines. These microorganisms break down nutrients in our food, aid our immunity, and help keep us healthy. The population balances among these organisms can vary in different people due to factors including genetics, lifestyle, and diet. More studies are needed to understand how dietary habits affect our intestinal microorganisms. Objective: To see how switching from a traditional Western diet (low in fiber, high in saturated fat) to a Mediterranean-like unprocessed foods diet (CLEAN-MED) changes the environment in the intestine. The CLEAN-MED diet includes lots of vegetables, fruits, and whole grains with little sugar or red meat. Eligibility: Healthy adults aged 18 to 60 Design: Participants will be divided into 2 groups. All will start with a trial week. Participants will log all the food they eat and answer questions about their diet throughout the entire study. Participants in the short-term group will eat a Western diet for 4 weeks and a CLEAN-MED diet for 4 weeks. Food will be provided for the CLEAN-MED diet. Participants will visit the clinic each week and complete surveys. They will log everything they eat. They will provide blood, urine, and stool samples. Participants in the long-term group will eat the CLEAN-MED diet for up to 12 months. They will visit the clinic each month and complete surveys. They will log everything they eat. They will provide blood, urine, and stool samples. Some foods will be provided for the first 2 weeks. Participants may choose to have a scan of their body composition every few months.
This study will assess the feasibility of delivering a 12-week time-restricted eating intervention as well as the intervention's preliminary efficacy on persistent cancer-related fatigue among cancer survivors compared to a general health education control. Participants will be randomized 1:1 to one of two arms: time-restricted eating or control. Those in the intervention arm will self-select a 10-hour eating window in which to consume all food and beverages (water is allowed any time, black coffee and unsweetened tea are allowed in the morning). Both groups will receive weekly educational tips on healthy lifestyle behaviors in cancer survivorship. This study will also explore relationships between fatigue, circadian rhythm, and glucose metabolism. The hypothesis is that recruitment will be feasible, and participants will adhere to time-restricted eating and complete study activities over the course of the 12 weeks. The second hypothesis is that time-restricted eating will lead to less fatigue at 12 weeks compared to the control, accounting for baseline fatigue levels.
Background: Diet is one of the most modifiable behaviors affecting health. But diet assessment measures that are based on self-report can be inaccurate. Researchers want better ways to address the role of diet in chronic disease. They want to see if stable isotopes can be used to better assess what people eat. Objective: To see if stable isotopes can help scientists identify things people eat. Eligibility: Healthy adults ages 18 to 65 Design: Participants will be screened with a medical history and physical exam. They will have blood and urine tests. These tests will be repeated during the study. Participants will stay in the inpatient unit of the NIH in Phoenix, Arizona, for 13 weeks. For 7 days, participants will eat a diet prepared by the NIH kitchen. They will get balanced meals that are 50% carbohydrates, 20% protein, and 30% fat. Then participants will be randomly placed on one of 3 diets containing different percentages of carbohydrates from soda. Participants height and weight will be measured. The amount of fat and muscle in their body will be measured by body scans that are similar to x-rays. Participants will have oral glucose tolerance tests. They will consume a sugar drink and then give blood samples over 3 hours. Participants will give hair and stool samples. Participants will complete a diet questionnaire. It assesses their food intake over 24 hours. Participants will complete behavioral questionnaires and computer performance tests. Participants will have fat biopsies taken from their stomach and thigh. Participants will have three 24-hour stays in a metabolic chamber. It is used to measure metabolism.
To the best of our knowledge, the effect of pasta consumption within a hypocaloric Mediterranean diet has only been scarcely explored yet. Therefore, a two-parallel group dietary intervention was carried out to investigate if pasta consumption could affect the BMI change in obese patients. The primary outcome was the loss of at leat 8% of the initial body weight in the first 6 months. Anthropometric and body composition (from bioelectrical impedance analysis - BIA-) measures were collected every month for the first 6 months and after 1 year. In addition, dietary information was collected at baseline and after 3, 6 and 12 months through a 7-day carbohydrate food record and a 24-h food recall. Blood samples were collected at baseline and at 6 and 12 months to assess: glucose, insulin, Homeostatic model assessment for insulin resistant (HOMA-IR) index, total cholesterol, low-density lipoprotein, high-density lipoprotein, and uric acid. Furthermore, the perceived quality of life was investigated through the 36-items short form health survey (SF36) questionnaire.
The purpose of this study is to evaluate the effect of especial diet therapy "Anti-inflammatory Diet" on inflammatory, oxidative stress, and nutritional markers in the context of protein-energy wasting syndrome(PEW) in hemodialysis patients.
Background: - LIFE-Moms (Lifestyle Interventions for Expectant Moms) is a national project that is studying pregnant women who are overweight or obese. It is looking at ways they can manage their weight gain in pregnancy and how this may affect them and their babies health at birth and through the first year. Researchers want to recruit pregnant women who are being treated at the Phoenix Indian Medical Center. They will participate in a two-part study. Objectives: - To study pregnant women who are in the LIFE-Moms project at the Phoenix Indian Medical Center. Eligibility: - Pregnant women at least 18 years of age who are overweight or obese. - Participants must be receiving care at the Phoenix Indian Medical Center. - Participants must be having only one child in their pregnancy (no twins or other multiple births). Design: - This study will have two parts. The first part will have three visits to obtain data about health early in pregnancy. It will also let participants and researchers find out if the participants are eligible and should continue in the second part of the study. In the second part, participants will be monitored throughout their pregnancy and during the first year after the baby s birth to test the effects of a lifestyle intervention to control weight gain during pregnancy. - On the Part 1 study visits, participants will have a physical exam and medical history. They will provide blood, urine, hair, and other samples to be examined for possible genetic conditions. - For the Part 2 study visits, participants will be placed in one of two treatment groups. Each group will receive the same prenatal and postnatal care that they would get if they did not join the study. - The first group will have a lifestyle intervention program. They will spend about 2 hours every week with other members of their group to learn diet and activity behaviors that may help with their health. - The second group will have an enhanced care program. They will be given additional information about health and pregnancy and be invited to attend three classes to learn about staying healthy during pregnancy.
Background: - Researchers who study health and nutrition are interested in developing more accurate methods of determining what people eat from day to day and how it affects their general health. In particular, better methods are needed to determine if people are accurately remembering what they ate. One possible method involves the use of biomarkers, or indicators in urine, blood, saliva, fat, and hair, which are related to the intake of a particular food in a consistent way. One set of biomarkers in blood samples and hair may be used to determine the relative amount of meat, fish, and soda (corn/sugar cane) in a person s diet. However, more research is needed to study the effectiveness of using these biomarkers to accurately track dietary intake. Objectives: - To validate the use of biomarkers as representative of specific dietary intake patterns (meat/fish/soda). Eligibility: - Healthy, nondiabetic men between 18 and 65 years of age. Design: - This study involves an initial screening visit and a 12-13 week inpatient dietary study period. - Participants will be screened with a medical history and physical examination, as well as blood and urine samples and a glucose tolerance test to exclude individuals who have diabetes. - After 3 days of a standard weight-maintaining diet, participants will have a glucose tolerance test and a body fat scan; provide hair, blood, and fat tissue samples; and complete questionnaires and performance tests. - Participants will spend one day in a metabolic chamber to measure their energy expenditure and general metabolism. - Participants will then be randomized into one of eight carefully designed diets for 12 weeks. The diets will differ in the amount of meat, fish, and soda, including one diet where none of the three biomarker-related foods will be permitted. Blood samples will be collected throughout the study diet period. - At the end of the 12-week study diet period, participants will provide additional hair, blood, and fat tissue samples, and will have a second metabolism assessment in the metabolic chamber....
Background: - Bariatric surgery is the most effective way to achieve significant, long-term weight loss. It has also been shown to be an effective therapy for obese individuals with type 2 diabetes: more than 70 percent of patients no longer need medications for diabetes after surgery. This resolution of diabetes is predominately caused by marked weight loss resulting in improved insulin sensitivity. However, the beneficial effects of bariatric surgery on type 2 diabetes cannot be accounted for entirely by weight loss, because many bariatric surgery patients have resolution of diabetes within 1 week following bariatric surgery, even before they lose a clinically significant amount of weight. - One possible reason for the rapid resolution of diabetes after bariatric surgery .is that during the first week after surgery, patients can eat very little (about 300 Calories per day). It is well known that reducing calories to this level improves diabetes. Another possibility is that changes in the flow of food through the intestines may improve diabetes. Evidence for this comes from the observation that patients after gastric bypass have better glucose levels than those who have gastric banding. Researchers are interested in determining how much of the improvement in diabetes in the first week after Roux-en-Y gastric bypass (RYGBP) surgery is due to restricting calories, and how much is due to other factors, such as bypassing the upper part of the small intestine. Objectives: - To determine the change in total body insulin sensitivity after RYGBP compared to caloric restriction without surgery. - To study possible reasons for improvements in diabetes after RYGBP. Eligibility: - Individuals 18 to 60 years of age who have a body mass index (BMI) greater than 35 and have type 2 diabetes. Design: - This is not a randomized study, and patients will not receive bariatric surgery as part of this study. Two groups of patients will be studied: those scheduled for RYGBP surgery and those not undergoing surgery. - RYGBP Surgery Participants: - Up to 3 weeks before surgery, participants will spend 2 nights and days at the Vanderbilt University Clinical Research Center or the NIH Clinical Center for testing to learn about how their bodies handle sugar and use energy. During the 5 days prior to these tests, participants will be asked to not take diabetes medications, and will check blood sugar at least twice a day. - From 8 days before surgery, participants will begin an 800 Calorie per day liquid diet to prepare for surgery. - After surgery and discharge, participants will be readmitted to the Clinical Research Center at Vanderbilt or NIH for further tests and diet monitoring. Diabetes medications may be adjusted or stopped altogether based on the results of the tests. - Non-surgery Participants: - Participants will spend 2 nights and days in the NIH Clinical Center for testing to learn about how their bodies handle sugar and use energy. During the 5 days prior to these tests, participants will be asked to not take diabetes medications, and will check blood sugar at least twice a day. - After the tests, participants will begin an 800 Calorie per day liquid diet for 8 days. - After 8 days, participants will be readmitted to the Clinical Center at NIH for 1 week of further tests and a 300 Calorie per day diet. Diabetes medications may be adjusted or stopped altogether based on the results of the tests.
This study will investigate how to better predict why some individuals gain or lose weight more easily than others. It will examine whether the increase in the amount of energy a body burns in 24 hours with overeating or the decrease over 24 hours with fasting can help determine how easily someone gains or loses weight. Healthy people between 18 and 60 years of age who have a body mass index (BMI) between 18.5 kg/m(2) and 24 kg/m(2) (for overfeeding study) or a BMI greater than 27 kg/m(2) with a body weight less than 350 pounds (weight loss study) may be eligible for this study. The study requires a 10-week admission to the NIH Clinical Center (2-week baseline, 6-week overfeeding/weight loss, 2-week post-weight change). Participants undergo the following tests and procedures during the hospital admission: - Medical history, physical examination and laboratory studies - Questionnaires to assess eating behavior, food preferences, body composition, and activity level - Body composition assessment (height, weight, waist circumference, and fat mass and muscle content through DXA and MRI scans) - Oral glucose tolerance test - Meal test to measure the response of certain hormones to food - Activity monitors to determine activity level - Metabolic chamber study to measure calories burned over 24 hours and monitor body temperature - Free-living energy use study to measure calories burned under normal home conditions over 7 days - Fat and muscle biopsies - Dietary intervention: Measurements of food intake and energy loss over a 6-week overfeeding (1.5 times the subject s normal food intake) or weight loss (one-half the subject s normal food intake) program Followup procedures after the inpatient stay: - Height and weight measurements at 6 months (overfeeding study participants) and monthly for the first year, at 3-month intervals for the second year, and then yearly for 3 more years (weight loss study participants) - Yearly visits (2-night inpatient stay) for all participants for repeat meal test, DXA, oral glucose tolerance test, behavioral questionnaires and, in women who can become pregnant, pregnancy test