Original Article

Effect of a Thermogenic Beverage on 24-Hour Energy Metabolism in Humans*

Servane Rudelle*, Mario G. Ferruzzi†, Isabelle Cristiani‡, Julie Moulin‡, Katherine Macé‡, Kevin J. Acheson‡ and Luc Tappy*

  1. *Department of Physiology, Lausanne University, Lausanne, Switzerland;
  2. †Purdue University, Department of Food Science, West Lafayette, Indiana; and
  3. ‡Nestlé Research Center, Vers-chez-les-Blanc, Lausanne, Switzerland.

Correspondence: Luc Tappy Department of Physiology, Lausanne University Rue du Bugnon 7, 1005 Lausanne, Switzerland. E-mail: Luc.Tappy@unil.ch

*The costs of publication of this article were defrayed, in part, by the payment of page charges. This article must, therefore, be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Received 31 January 2006; Revised  00; Accepted 22 September 2006.

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Abstract

Objective:

 

To test whether consumption of a beverage containing active ingredients will increase 24-hour energy metabolism in healthy, young, lean individuals.

Research Method and Procedures:

 

Thirty-one male and female subjects consumed 3 times 250-mL servings of a beverage containing green tea catechins, caffeine, and calcium for 3 days in a single-center, double-blind, placebo-controlled, cross-over design study. On the 3rd day, 23-hour energy metabolism, extrapolated to 24-hour, was measured in a calorimeter chamber. Blood pressure and heart rate were measured, and total day and night urines were analyzed for urea and catecholamine excretion.

Results:

 

Twenty-four-hour energy expenditure (EE) and 24-hour fat oxidation were lower in women than in men (p < 0.0001 and p < 0.015, respectively). Although there were no treatment or treatment/gender effects on substrate oxidation, treatment increased 24-hour EE by 106 plusminus 31 kcal/24 hours (p = 0.002), equivalent to 4.7 plusminus 1.6 kcal/h (day; p = 0.005) and 3.3 plusminus 1.5 kcal/h (night; p = 0.04). No significant differences were observed in hemodynamic parameters.

Discussion:

 

The present study provides evidence that consumption of a beverage containing green tea catechins, caffeine, and calcium increases 24-hour EE by 4.6%, but the contribution of the individual ingredients cannot be distinguished. Although this increase is modest, the results are discussed in relation to proposed public health goals, indicating that such modifications are sufficient to prevent weight gain. When consumed regularly as part of a healthy diet and exercise regime, such a beverage may provide benefits for weight control.

Keywords:

24-hour energy expenditure, fat oxidation, green tea, caffeine, epigallocatechin gallate

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