The Effects of Antioxidants in Blueberry Powder on Inflammation Induced by a Single High Fat Meal.

NCT ID: NCT01594008

Last Updated: 2015-03-24

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 43 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2012-01-31
• Study Completion Date: 2013-05-31

Brief Summary

The goal of the study is to find out whether a high fat meal increases blood lipids and causes monocyte (white blood cell) activation, and whether blueberry intake at the same meal lessens monocyte activation in healthy people.

Detailed Description

This study was designed as a single blind, placebo-controlled crossover study. Subjects were never told what dose of blueberry powder was given. Researchers handling samples and data did not know what dose of blueberry powder subjects received on test day 2 or 3. The frozen blueberry yogurt supplemented with either control or blueberry powder was coded by letter, and samples were coded by test day: since the control powder was given on the first day to all subjects, the laboratory staff analyzing the samples would have known that the first day samples were from the subjects receiving the control powder.The provision of the control powder on the first day to all subjects was done to mitigate potential carry over effects of the blueberry powder.The randomization plan for the two doses (two vs four servings) of blueberry powder was uploaded into a spreadsheet of which only the registered dietitian, the Human Studies Manager, and the Metabolic Kitchen and Human Feeding Laboratory staff had access. Subjects were instructed by a registered dietitian to follow a low polyphenol and omega-3 diet and limit consumption of fruits, vegetables, soy, fatty fish (e.g. salmon), whole grains, nuts, coffee, tea, and chocolate starting 3 days prior to each test day. The night before each test day, subjects were required to eat a standardized dinner provided by the WHNRC. Since a previous meal may impact the postprandial response of the next, subjects were fed a dinner that consisted of a burrito with tortilla, chicken, cheese, oil, and pinto beans as well as yogurt and lemonade. On each test day, subjects arrived at the WHNRC after a 12-hour overnight fast. Subjects had their body temperature, blood pressure, and weight measured, and then had blood withdrawn. Subjects were fed the MHF breakfast supplemented with a frozen yogurt containing either control or blueberry powder. Subjects were given 20 minutes to consume the entire breakfast. Subjects were instructed not to eat or drink anything other than plain water. Three and one-half hours following consumption of the test meal each subject returned to the WHNRC for a postprandial blood draw. Postprandial hypertriglyceridemia peaks on average 3.5 hours after the consumption of a high fat breakfast, thus the 3.5 hour blood draw provides the highest concentration of TGRL. Subjects were allowed to return to their normal activities after the morning meal before the postprandial blood draw. Following the postprandial blood draw, subjects were allowed to return to their normal dietary habits until three days prior to their next test day. Subjects were fed the control powder on their first test day. On the second and third test days subjects were fed varying amounts of the blueberry powder that were equivalent to two or four servings of fresh blueberries (24.1 g and 48.2 g of blueberry powder, respectively) in a random order.

Conditions

Inflammation

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: SINGLE

Interventions

Breakfast meal with placebo powder

Zero serving equivalents (1 serving equivalent = ½ cup fresh raw blueberries) of blueberries in the form of a mixed side dish comprising frozen yogurt, sugar, and placebo powder.

Intervention Type: OTHER

Breakfast meal with 2 serving equivalents of blueberries

Two serving equivalents (1 serving equivalent = ½ cup fresh raw blueberries) of blueberries in the form of a mixed side dish comprising frozen yogurt, sugar, and freeze-dried blueberry powder.

Intervention Type: OTHER

Breakfast meal with 4 serving equivalents of blueberries

Four serving equivalents (1 serving equivalent = ½ cup fresh raw blueberries) of blueberries in the form of a mixed side dish comprising frozen yogurt, sugar, and freeze-dried blueberry powder.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Healthy adults
• Able to complete study procedures
• Body Mass Index 18 - 24.9 kg/m2

Exclusion Criteria

• Diabetes mellitus
• Kidney disease
• Liver disease
• Thyroid disease
• Bleeding disorders
• Autoimmune diseases and other inflammatory disease
• Cancer, unless in remission for > 5 years
• Blood cell counts outside the normal range for age and gender
• Blood chemistry panels outside the normal range for age and gender
• Blood cholesterol greater than 240 mg/dL
• Blood triacylglycerol greater than 300 mg/dL
• Hemoglobin less than 11.5 g/dL
• Hypertension, blood pressure greater than 140/90 mmHg
• Follow a vegetarian diet
• Smoke or use tobacco products
• Drink more than one alcoholic beverage per day
• Taking cholesterol-lowering or blood pressure medication
• Daily or regular use of antihistamines
• Use of nonsteroidal anti-inflammatory drugs (NSAIDs)
• Use of steroids for asthma or other inflammatory diseases
• Use of thyroid-regulating drugs
• Use of over the counter weight loss products
• Known allergies or sensitivities to food ingredients in the test meals
• Taking fish or algal oil supplements and unwilling to stop
• Pregnant and lactating women

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 60 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

U.S. Highbush Blueberry Council

OTHER

Sponsor Role: collaborator

USDA, Western Human Nutrition Research Center

FED

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Daniel Hwang, PhD

Role: PRINCIPAL_INVESTIGATOR

USDA, ARS, Western Human Nutrition Research Center

John Rutledge, MD

Role: PRINCIPAL_INVESTIGATOR

University of California, Davis

Locations

USDA, ARS, Western Human Nutrition Research Center

Davis, California, United States

Countries

United States

References

Ono-Moore KD, Snodgrass RG, Huang S, Singh S, Freytag TL, Burnett DJ, Bonnel EL, Woodhouse LR, Zunino SJ, Peerson JM, Lee JY, Rutledge JC, Hwang DH. Postprandial Inflammatory Responses and Free Fatty Acids in Plasma of Adults Who Consumed a Moderately High-Fat Breakfast with and without Blueberry Powder in a Randomized Placebo-Controlled Trial. J Nutr. 2016 Jul;146(7):1411-9. doi: 10.3945/jn.115.223909. Epub 2016 Jun 15.

Reference Type: DERIVED

PMID: 27306892 (View on PubMed)

Related Links

http://www.ars.usda.gov/Main/docs.htm?docid=11240

USDA Western Human Nutrition Research Center

Other Identifiers

250305-3

Identifier Type: -

Identifier Source: org_study_id