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The Effects of Strawberry Supplementation on Memory and Gait Among Over-weight Older Adults

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT03162913
Recruitment Status : Recruiting
First Posted : May 22, 2017
Last Update Posted : May 18, 2022
California Strawberry Commission
Information provided by (Responsible Party):
Barbara Shukitt-Hale, USDA Human Nutrition Research Center on Aging

Brief Summary:
This study is being conducted to assess the effect of dietary strawberry supplementation on cognition and mobility in obese middle-aged and older adults. It is hypothesized that plant compounds, present in strawberries, may improve cognition and mobility.

Condition or disease Intervention/treatment Phase
Aging Age-related Cognitive Decline Obesity Dietary Supplement: Strawberry Other: Placebo Not Applicable

Detailed Description:
Previously, the investigators have shown that dietary berry fruit are able to reverse several parameters of brain aging, as well as age-related motor and cognitive deficits when fed to aged rats. They have shown that strawberry, in particular, can reduce oxidative stress and pro-inflammatory signaling in the brain and improve both mobility and cognition. A recent study also found that the addition of two servings of strawberry per day for 3 months could significantly improve verbal and spatial memory among healthy older adults, particularly on tests with high cognitive demand. These effects may reflect the direct effects of strawberries' bioactive and neuroavailable polyphenols on brain signaling or their indirect effects through antioxidant and anti-inflammatory pathways. However, participants in that study were selected from a healthy aging population, which made it difficult to detect changes in balance, mobility, and the less complex cognitive tasks. Therefore, the investigators are proposing the current study to assess the effects of dietary strawberry on mobility and cognition among a compromised population, obese older adults, who are at increased risk for cardiovascular, metabolic, and neurodegenerative disease. The risk for heart disease, diabetes, stroke, cancer and dementia increases in direct relation to overweight and obesity measures, and research now shows that obesity is a primary cause of mental deterioration among the middle-aged and senior populations. In this study, obese older adults (55-75yo, BMI 30-36) will consume 24g/d freeze-dried strawberry or control powder for 3 months and complete a battery of lifestyle, mobility, and cognitive tests at 3 time points. The investigators hypothesize that supplementing obese older adults' diet with strawberry will improve performance on complex tasks involving mobility and cognition.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 49 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Prevention
Official Title: The Effects of Strawberry Supplementation on Memory and Gait Among Over-weight Older Adults
Actual Study Start Date : October 1, 2017
Estimated Primary Completion Date : October 1, 2022
Estimated Study Completion Date : March 1, 2023

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Strawberry
Participants randomized into this arm of the study consume freeze-dried strawberry powder.
Dietary Supplement: Strawberry
12g freeze-dried strawberry (powder), twice daily with water, for 90 days

Placebo Comparator: Placebo
Participants randomized into this arm of the study consume a strawberry placebo powder.
Other: Placebo
12g red, strawberry-flavored powder, twice daily with water, for 90 days

Primary Outcome Measures :
  1. Spatial Cognition [ Time Frame: Change from baseline at 90 days ]
    Spatial cognition will be measured using a virtual navigation task.

Secondary Outcome Measures :
  1. Gait Speed [ Time Frame: Change from baseline at 90 days ]
    Preferred gait speed will be measured using an instrumented treadmill.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   55 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Between the ages of 55 and 75 years
  • Body mass index (BMI) between 30-40
  • Hemoglobin A1C level between 5.7 and 6.4%
  • Height between 60 and 74 inches tall
  • Adequate visual acuity or corrected visual acuity to read and perform computer tasks
  • Fluency in spoken and written English
  • Ability to walk independently for 20 minutes as per self-report.
  • Women must be postmenopausal (absence of menstruation for a minimum of 12-months or bilateral oophorectomy)
  • Willing to abstain from recreational drug use

Exclusion Criteria:

  • Vegetarian or vegan
  • Cognitive impairment, memory loss, or neurologic/psychological disorder that interfere with activities of daily living
  • Muscle or mobility deficit that would interfere with walking independent for 20 minutes
  • Chronic conditions associated with increased risk of falls or falls within the last year that were not precipitated by unusual circumstances (e.g. slipping on ice, being pushed)
  • Gastrointestinal diseases, conditions, or medications influencing gastrointestinal absorption
  • Use of medications or dietary supplements known or suspected to influence study outcomes
  • Mini Mental State Exam (MMSE) score of less than 24 at screening
  • Diabetes mellitus diagnosis or fasting glucose >= 126 mg/dL or taking diabetes medication
  • Liver dysfunction, history of cirrhosis, or elevated SGPT, SGOT, or total bilirubin
  • Kidney disease as indicated by serum creatinine > 1.5 mg/dL at screening
  • Uncontrolled blood pressure
  • Cardiac or pulmonary conditions that limit ambulation or results in dyspnea with ambulation
  • Allergy to strawberry or ingredients in the placebo.
  • Ethanol use above 2 servings/day of beer (12-ounces), wine (5 ounces) or liquor (1.5 ounces), or binge-drinking
  • Recent inflammatory diseases (for example: rheumatoid arthritis, lupus)
  • Cigarette smoking, use of nicotine replacement products, or smoking of marijuana/consumption of edibles in past 3 months or during the course of the study
  • History of stomach or bowel resection (other than appendectomy), gastric bypass or other bariatric weight loss procedure
  • Cancer of any type (except for non-melanoma skin) in past 3 yrs or actively using cancer chemotherapeutic agents
  • Clotting/bleeding disorders or ongoing anticoagulant use
  • Bilateral mastectomy with nodal dissection
  • No social security number (unable to pay stipend)
  • Blood biochemistries outside of normal range
  • Prior participation in a study involving berry supplementation at our institution

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03162913

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Contact: Kimberly Dupiton 617-556-3012

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United States, Massachusetts
Tammy M Scott Recruiting
Boston, Massachusetts, United States, 02111
Contact: Tammy M Scott, PhD    617-556-3366   
Principal Investigator: Tammy M Scott, PhD         
Principal Investigator: Barbara Shukitt-Hale, PhD         
Sub-Investigator: Marshall G Miller, PhD         
Sponsors and Collaborators
USDA Human Nutrition Research Center on Aging
California Strawberry Commission
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Principal Investigator: Tammy M Scott, PhD Tufts University
Principal Investigator: Barbara Shukitt-Hale, PhD USDA Human Nutrition Research Center on Aging
Additional Information:
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Responsible Party: Barbara Shukitt-Hale, Research Psychologist, USDA Human Nutrition Research Center on Aging Identifier: NCT03162913    
Other Study ID Numbers: 12523
First Posted: May 22, 2017    Key Record Dates
Last Update Posted: May 18, 2022
Last Verified: May 2022
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Barbara Shukitt-Hale, USDA Human Nutrition Research Center on Aging:
Additional relevant MeSH terms:
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Cognitive Dysfunction
Cognition Disorders
Neurocognitive Disorders
Mental Disorders
Body Weight