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The purpose of this study is to examine whether older adults taking a fruit/vegetable supplement for 6 weeks will modify the biochemical values of stool, blood, and urine to be similar to those of younger adults. Participants will be asked to consume prepackaged study meals provided by the Center for approximately 8 weeks and to provide blood, stool, and urine samples on 2 separate occasions.

Target Population
Men and women aged 55 years and older

Major Exclusions
BMI < 26 and > 40 kg/m2
Vegetarians or vegans
Pregnant or breastfeeding
Allergy to any plant foods
Irregular bowel movements (<3 times per week)
Diabetes, kidney or gastrointestinal disease, rheumatoid arthritis, gout
Alcohol consumption of 2 or more drinks per day
 Fruit and vegetable consumption <3 times daily; however if consuming <6 servings of fruits and vegetables daily, must be willing to reduce intake to <3 servings prior to enrollment.

Length of Study
Approximately 8 weeks

Number of Visits
1 screening visit; 6 study visits for collection of blood, urine, stool samples, as well as collecting dietary and clinical information (i.e., blood pressure, weight, etc.), and to pick up prepackaged meals.


Can I work?

Study diet
All foods and beverages will be provided during the 8-week period. The study meals will be comprised of mostly foods that are typical to the diet that average Americans are consuming daily.

Participants must be willing to stop all dietary supplements for the duration of the study, except for the fruit/vegetable supplements provided on the study for 6 weeks.

$480 for participants who qualify and complete the entire study → $25 for screening, and up to $600 for participants who qualify and complete the entire study

Length of study

Total length of the study including resident stays and nonresident visits.
This does not mean you will be testing the entire time.

The length of time volunteers are required to stay overnight at the HNRCA. Residents have their own private room, bathroom, television, VCR, and phone during their stay.

The amount of reimbursement for travel and inconvenience.
Number of visits

Total number of nonresident visits.
Study diet

Indicates meals which will be provided by the HNRCA
Can I work?

Indicates if you will be able to work and if so, when.

For more information about this study, please call Volunteer Services at 1-800-738-7555.

We appreciate your interest in our program and we hope to work with you in the future.

Thank you,
The Recruitment Office
Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University