NEW Dietary Interventions to Enhance the Treatments for Weight Loss (NEW DIETs for Weight Loss Study)
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 63
- 试验地点
- 1
- 主要终点
- Weight Loss
研究概览
简要总结
Several studies have shown differences in health-related outcomes by dietary pattern. These patterns have included those participants following vegan (no meat, poultry, fish, dairy, or eggs), vegetarian (no meat, poultry, or fish), pesco- vegetarian (no meat or poultry), semi-vegetarian (red meat and poultry ≥ 1 time/month and < 1 time/week), or omnivorous diets. These studies have shown that of these dietary patterns, vegans have the lowest BMIs, lowest prevalence of Type 2 diabetes, and lowest amount of weight gain over 5 years. In addition, vegetarians have significantly better metabolic risk factors as compared to non-vegetarians. While these initial observational studies have shown benefits to consuming more plant-based diets, there have been no randomized trials examining the differences in health outcomes among these dietary patterns. To begin exploring this research area, the investigators will conduct a pilot study which will randomize participants to one of the 5 dietary approaches. Participants (n=75) in the NEW DIETs Study will be recruited to follow their randomly assigned diet for 8 weeks and attend weekly sessions to learn about nutrition and cooking.
详细描述
This study involves five groups. Participants will be randomly assigned to one of these groups. All groups will receive information on a dietary approach aimed at losing weight. All groups will be asked to favor foods that are low fat and have a low glycemic index, which means they will be asked to favor foods that don't cause a quick rise in blood sugar (for example, choosing oatmeal over cornflakes for breakfast). All groups will also be asked to take a vitamin B-12 supplement each day of their choosing (can be a multivitamin).
Participants who are eligible on the online screener will be contacted by phone to complete a few additional screening questions and invited to an orientation meeting.
Below are the steps in the study:
- If participants are accepted into the study, participants will come to the study site (USC Public Health Research Center) to learn more about the study, have their weight and height measured, learn how to complete questionnaires online, and complete their consent form. This meeting will last approximately 1.5 hours.
- Participants will then complete some questionnaires that measure their diet and physical activity levels on a computer at home or other location where participants have computer/internet access. We will also ask participants to keep all their grocery and restaurant receipts during this time to bring back with participants to the next meeting.
- Participants will come back for a meeting to have their weight measured again and participants will find out their diet group assignment. Participants will receive a 1.25 hour overview of the diet participants have been assigned to and be provided with materials on this diet.
- If participants are assigned to the vegan, vegetarians, pesco-, or semi-vegetarian diets, they will complete the following over the 8-week study:
- Participants will attend weekly meetings over 8 weeks.
- We will obtain their weight and collect online questionnaires at weeks 4 and 8.
- During the 8-week study, we will ask participants to complete an online weekly questionnaire which will assess if participants are following the diet and their weight. This will take approximately 5 minutes to complete.
- If participants are assigned to the omnivorous diet, they will only come in for meetings at baseline, 4 weeks, and 8 weeks.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 65 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •be between the ages of 18-65
- •have access to a computer with Internet capabilities
- •be overweight (Body Mass Index of 25-49.9)
- •be able to attend weekly evening meetings at the University of South Carolina in Columbia, SC (up to 8 total) starting late January 2013.
排除标准
- •Participants will be ineligible to participate if they:
- •have a Body Mass Index less than 25 or greater than 49.9 kg/m2
- •are currently pregnant
- •are younger than 18 or older than 65 years of age
- •are unable to attend weekly meetings for 8 weeks
- •don't have access to the Internet and a computer
- •don't have access to a scale for self-monitoring weight
- •aren't willing to be randomized to one of five dietary groups
- •have a psychiatric disease, drug or alcohol dependency, or uncontrolled thyroid condition
- •have a major health condition, such as heart conditions, diabetes, and past incidence of stroke
- •have an eating disorder (participants will be screened using the Eating Attitudes Test screener-participants who do not pass this screener will be asked to contact their physician)
- •currently participating in a weight loss program or taking weight loss medications
- •currently following a vegan, vegetarian, or pesco-vegetarian diet
研究组 & 干预措施
Vegan
A vegan diet is one that does not contain any animal products (no meat, fish, poultry, eggs, or dairy) but emphasizes plant-based foods, such as fruits, vegetables, whole grains, and legumes/beans. We will also ask you to keep foods low in fat and low in glycemic index.
干预措施: Diet (Behavioral)
Vegetarian
A vegetarian diet is one that does not contain meat, fish, or poultry but does contain eggs and dairy, in addition to plant-based foods, such as fruits, vegetables, whole grains, and legumes/beans. We will also ask you to keep foods low in fat and low in glycemic index.
干预措施: Diet (Behavioral)
Pesco-Vegetarian
A pesco-vegetarian diet is one that does not contain meat or poultry but does contain fish and shellfish, eggs, and dairy, in addition to plant-based foods, such as fruits, vegetables, whole grains, and legumes/beans. We will also ask you to keep foods low in fat and low in glycemic index.
干预措施: Diet (Behavioral)
Semi-Vegetarian
A semi-vegetarian diet is one that contains all foods, including meat, poultry, fish and shellfish, eggs, and dairy, in addition to plant-based foods, such as fruits, vegetables, whole grains, and legumes/beans. However, red meat is limited to one time per week and poultry is limited to 5 times per week or less. We will also ask you to keep foods low in fat and low in glycemic index.
干预措施: Diet (Behavioral)
Omnivorous
An omnivorous diet contains all food groups. However, as part of this study, we will ask participants in this group to keep foods low in fat and low in glycemic index. Participants in this group will not need to attend weekly meetings but will receive information via e-mail each week.
干预措施: Diet (Behavioral)
结局指标
主要结局
Weight Loss
时间窗: 8 weeks
次要结局
- Dietary Intake(8 weeks)
研究者
Brie Turner-McGrievy
Assistant Professor
University of South Carolina