B181: Stimulation of Thermogenesis by Bio-Active Food Ingredients

Study Overview
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Brief Summary
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The primary aim was to measure the effect of green tea extract, tyrosine and caffeine on energy expenditure, appetite ratings and spontaneous energy intake together with recording of side effects in healthy normal weight subjects.

Detailed Description
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Background: Long-term weight maintenance of a weight loss is often unsuccessful. Often a weight regain is observed in most studies that could indicate that most subjects are not able to change their eating habits. There is a need for simple and safe methods to prevent weight gain and re-gain i.e. by increasing thermogenesis and decrease spontaneous energy intake (EI). Studies have shown that nutritional and food-related non-nutritional factors influence the adjustment of EI and EE as the compounds can enhance the diet-induced thermogenesis (DIT) and suppress appetite. Method: The present study was designed as a 4-way crossover, randomised, placebo controlled, dou-ble-blind study. Each treatment was separated by >3 d washout period. All treatments were administered as tablets containing either 500 mg green tea extract (whereof 125 mg cate-chins), 400 mg tyrosine, 50 mg anhydrous caffeine, or placebo. on each test day body weight and composition was assessed. All participants underwent a 4.5-h assessment of energy expenditure by indirect calorimetry in a ventilated hood. Energy intake recorded of an ad libitum pasta salad brunch served after the last hood measurement Subjects: Twelve healthy lean (20<BMI<25) weight stable non-smoking subjects between 18-40 years of age were tested 4 times each with a wash-out period of at least 3 days.

Official Title
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B181: Stimulation of Thermogenesis by Bio-Active Food Ingredients

Conditions
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Obesity

Intervention / Treatment
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* Drug: tyrosine, green tea, caffeine


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Twelve healthy and normal-weight men (age: 23.72.6 y, BMI: 22.41.8 kg/m2) participated in the study. They were weight stable (within 3-kg in last 3 mo), non-smoking, non-athletic, and had no use of dietary supplements or frequent use of medication. Exclusion Criteria: -

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: tyrosine, green tea, caffeine|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| heart rate |  |  | 
| blood pressure |  |  | 
| enegy expenditure |  |  | 
| energy intake |  |  | 
| subjective appetite sensations |  |  | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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green tea, caffeine, tyrosine, energy expenditure, energy intake