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There are two primary objectives to be addressed in this study: to assess the differential response in bioavailability and metabolic pathways between lean and obese individuals exposed to acute, short term (14 day), and long-term (10-week) consumption of polyphenol-rich fruits (berries and apple), and beverages (tea); and to determine the differential systemic and gut anti-inflammatory response between obese and lean individuals exposed to polyphenol-rich fruits (berries and apple), and beverages (tea).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Polyphenol Diet | Experimental | After 2 weeks of adaptation to a controlled diet, polyphenol-rich fruits (berries and apple) and beverages (tea) will be fed (8 wks) as part of a controlled diet (10 wks total). |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Controlled diet | Other | Volunteers will be provided a controlled diet during the entirety of the 10 week treatment period. Meals will be prepared using traditional American foods. The controlled diet will include polyphenol-rich foods, including apples, berries, and green tea. A blend of multiple polyphenol-rich foods was chosen to investigate whole foods, multiple commodities, and multiple bioactives. |
| Measure | Description | Time Frame |
|---|---|---|
| Polyphenol metabolites - Wk 2 | Polyphenol metabolites will be measured in blood and urine after 2 weeks of a controlled diet. | 2 weeks after start of intervention |
| Polyphenol metabolites - Wk 4 | Polyphenol metabolites will be measured in blood and urine after 4 weeks of a controlled diet. Weeks 3 and 4 will contain fruits and beverage rich in polyphenols. | 4 weeks after start of intervention |
| Polyphenol metabolites - Wk 10 | Polyphenol metabolites will be measured in blood and urine after 10 weeks of a controlled diet. Weeks 3 through 10 will contain fruits and beverage rich in polyphenols. | 10 weeks after start of intervention |
| Systemic inflammation - Wk 2 | Markers of inflammation (such as CRP, serum amyloid A, IL-6, IL-1B, TNF, and interferon-gamma will be measured. | 2 weeks after start of intervention |
| Systemic Inflammation - Wk 4 | Markers of inflammation (such as CRP, serum amyloid A, IL-6, IL-1B, TNF, and interferon-gamma will be measured. | 4 weeks after start of intervention |
| Systemic Inflammation - Wk 10 | Markers of inflammation (such as CRP, serum amyloid A, IL-6, IL-1B, TNF, and interferon-gamma will be measured. | 10 weeks after start of intervention |
| Measure | Description | Time Frame |
|---|---|---|
| Gastrointestinal Health - Wk 2 | Gut permeability and inflammation will be measured in fecal samples. | 2 weeks after start of intervention |
| Gastrointestinal Health - Wk 4 | Gut permeability and inflammation will be measured in fecal samples. |
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Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Beltsville Human Nutrition Center | Beltsville | Maryland | 20705 | United States |
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| Wk 4 |
| Gastrointestinal Health - Wk 10 | Gut permeability and inflammation will be measured in fecal samples. | 10 weeks after start of intervention |