Cardiovascular Risk Factor
Conditions
Brief summary
Whole food-based dietary interventions have the potential to promote cardiometabolic health via multiple mechanisms, including improvements in blood pressure, bad cholesterol, and other markers of metabolic health. Previous research suggests that grapes have the potential to promote optimal cardiometabolic function by reducing LDL-C, but it remains unclear whether there is a dose-response relationship. Moreover, few studies have evaluated effects on vascular health following daily grape consumption. We propose to examine the effects of 6-8 weeks of supplementation with freeze dried grape powder (69 g/d; \ three ¾ cup servings) compared to a control powder without grapes on: 1) bad cholesterol and blood pressure and 2) other measures of cardiometabolic health, including glucose and insulin. We will enroll overweight (BMI 25-36 kg/m2) but otherwise healthy adults with moderately elevated LDL-C (\>115 mg/dL for women and \>130 mg/dL for men) and/or blood pressure of120-159/80-99 mm Hg. This will optimize the potential for observing significant changes in these measures of health. We will recruit 20 eligible participants with the expectation that at least 15 will complete the study. The placebo-controlled, crossover study design will allow for a direct comparison of effects within the same participant. We anticipate that the bioactive components of grapes will promote cardiometabolic health via changes in LDL-C and blood pressure. Results from the proposed study would help to clarify how daily grape consumption might promote health and would provide further support for incorporating whole, unprocessed fruit in a healthy dietary pattern.
Interventions
DIETARY_SUPPLEMENTGrape Powder
69 g/d freeze dried grape powder
DIETARY_SUPPLEMENTPlacebo Powder
69 g/d placebo powder matched for taste and appearance
Sponsors
University of Arizona
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
PREVENTION
Masking
DOUBLE (Subject, Investigator)
Eligibility
Sex/Gender
ALL
Age
30 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
* BMI of 25-36 kg/m2 * At least one of the following: * LDL-C above 115 mg/dL (women) or above 130 mg/dL (men) * Systolic blood pressure of 120-159 mmHg * Diastolic blood pressure of 80-99 mmHg
Exclusion criteria
* Allergies to grapes * History of CVD, blood pressure ≥ 160/100 mmHg, kidney disease, diabetes, or inflammatory diseases such as GI disorders and rheumatoid arthritis * Use of medications/supplements for elevated lipids, blood pressure, or glucose * Chronic use of non-steroidal anti-inflammatory or immunosuppressant drugs * Conditions requiring chronic use of steroids
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| LDL-C/non-HDL-C | 6-8 weeks | — |
| Brachial and central blood pressure | 6-8 weeks | systolic and diastolic pressures |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Other lipids and lipoproteins | 6-8 weeks | HDL-C, total cholesterol, and triglycerides |
| Pulse Wave Velocity (PWV) | 6-8 weeks | — |
| Insulin | 6-8 weeks | fasting blood insulin |
| Glucose | 6-8 weeks | fasting blood glucose |
| Augmentation Index | 6-8 weeks | augmentation index corrected for heart rate |
Countries
United States
Outcome results
None listed