Impact of Black Pepper on Energy Expenditure and Substrate Utilization

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

18 participants

Study Classification

INTERVENTIONAL

Study Start Date

2011-04-30

Study Completion Date

2011-07-31

Brief Summary

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As obesity rates worldwide continue to increase, there is a focus on identifying active food ingredients which increase metabolic rate which can be used as a dietary supplement in the treatment of overweight and obesity. Promising animal and cell studies have suggested a role for black pepper and an active component of black pepper, piperine, in energy expenditure. However, the effects of black pepper have not been determined in humans. The investigators hypothesis if that consumption of 1.5g black pepper (0.5g in each of three meals over one day) will result in an elevation in 24-h resting energy expenditure when contrasted to a control day (no black pepper, same diet intake).

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Detailed Description

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Conditions

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Obesity

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

NONE

Study Groups

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Black pepper

During the black pepper study day, subjects consumed 1.5g of black pepper (0.5g/meal) in 60.8g of vegetable juice. Black pepper was consumed was a meal on each occasion. 24-hour energy expenditure and substrate utilization will be measured.

Group Type ACTIVE_COMPARATOR

24-hour energy expenditure and substrate utilization

Intervention Type OTHER

Subjects spent two x 24-hour periods inside the metabolic chamber at the UNC NRI (black pepper and no pepper control) each separated by one week. Subjects were requested to arrive at the study center each morning in a fasted state (at least 10 hours). During each study day, subjects remained sedentary. All meals were provided and were tailored to each subject's specific energy requirements. Study meals (with the exception of the 1.5g of black pepper) were identical between the black pepper and no pepper control study days.

No pepper control

During the no pepper control study day, subjects consumed an identical menu without black pepper. 60.8g of vegetable juice (vehicle) was consumed at each of the three study meals. 24-hour energy expenditure and substrate utilization will be measured.

Group Type PLACEBO_COMPARATOR

24-hour energy expenditure and substrate utilization

Intervention Type OTHER

Subjects spent two x 24-hour periods inside the metabolic chamber at the UNC NRI (black pepper and no pepper control) each separated by one week. Subjects were requested to arrive at the study center each morning in a fasted state (at least 10 hours). During each study day, subjects remained sedentary. All meals were provided and were tailored to each subject's specific energy requirements. Study meals (with the exception of the 1.5g of black pepper) were identical between the black pepper and no pepper control study days.

Interventions

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24-hour energy expenditure and substrate utilization

Subjects spent two x 24-hour periods inside the metabolic chamber at the UNC NRI (black pepper and no pepper control) each separated by one week. Subjects were requested to arrive at the study center each morning in a fasted state (at least 10 hours). During each study day, subjects remained sedentary. All meals were provided and were tailored to each subject's specific energy requirements. Study meals (with the exception of the 1.5g of black pepper) were identical between the black pepper and no pepper control study days.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Woman
* Postmenopausal
* Aged 50-65 years
* BMI 25-35kg/m2
* Not taking blood pressure or anti-inflammatory medications or any other medications that may impact the results
* Thyroid hormone profile within the normal reference range
* No medical condition which may impact the results (e.g. diabetes)
* Accustomed to eating regular meals including breakfast