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Université de Fribourg

The thermic effect of sugar-free Red Bull: Do the non-caffeine bioactive ingredients in energy drinks play a role?

Miles-Chan, Jennifer L. ; Charrière, Nathalie ; Grasser, Erik K ; Montani, Jean-Pierre ; Dulloo, Abdul G

In: Obesity, 2015, vol. 23, no. 1, p. 16–19

Objective: Consumption of energy drinks is increasing amongst athletes and the general public. By virtue of their bioactive ingredients (including caffeine, taurine, glucuronolactone, and B-group vitamins) and paucity of calories, sugar-free “diet” versions of these drinks could be a useful aid for weight maintenance. Yet little is known about the acute influence of these drinks, and...

Université de Fribourg

How dieting makes the lean fatter: from a perspective of body composition autoregulation through adipostats and proteinstats awaiting discovery

Dulloo, Abdul G. ; Jacquet, Jean ; Montani, Jean-Pierre ; Schutz, Yves

In: Obesity Reviews, 2015, vol. 16, p. 25–35

Whether dieting makes people fatter has been a subject of considerable controversy over the past 30 years. More recent analysis of several prospective studies suggest, however, that it is dieting to lose weight in people who are in the healthy normal range of body weight, rather than in those who are overweight or obese, that most strongly and consistently predict future weight gain. This paper...

Université de Fribourg

Dieting and weight cycling as risk factors for cardiometabolic diseases: who is really at risk?

Montani, Jean-Pierre ; Schutz, Yves ; Dulloo, Abdul G.

In: Obesity Reviews, 2015, vol. 16, p. 7–18

Despite the poor prognosis of dieting in obesity management, which often results in repeated attempts at weight loss and hence weight cycling, the prevalence of dieting has increased continuously in the past decades in parallel to the steadily increasing prevalence of obesity. However, dieting and weight cycling are not limited to those who are obese or overweight as substantial proportions of...

Université de Fribourg

P38 mitogen-activated protein kinase is involved in arginase-II-mediated eNOS-Uncoupling in Obesity

Yu, Yi ; Rajapakse, Angana G. ; Montani, Jean-Pierre ; Yang, Zhihong ; Ming, Xiu-Fen

In: Cardiovascular Diabetology, 2014, vol. 13, no. 1, p. 113

Background Endothelial nitric oxide synthase (eNOS)-uncoupling links obesity-associated insulin resistance and type-II diabetes to the increased incidence of cardiovascular disease. Studies have indicated that increased arginase is involved in eNOS-uncoupling through competing with the substrate L-arginine. Given that arginase-II (Arg-II) exerts some of its biological functions through crosstalk...

Université de Fribourg

Cardiovascular responses to the ingestion of sugary drinks using a randomised cross-over study design: does glucose attenuate the blood pressure-elevating effect of fructose?

Grasser, Erik K. ; Dulloo, Abdul ; Montani, Jean-Pierre

In: British Journal of Nutrition, 2014, vol. 112, no. 02, p. 183–192

Overconsumption of sugar-sweetened beverages has been implicated in the pathogenesis of CVD. The objective of the present study was to elucidate acute haemodynamic and microcirculatory responses to the ingestion of sugary drinks made from sucrose, glucose or fructose at concentrations similar to those often found in commercial soft drinks. In a randomised cross-over study design, twelve young...

Université de Fribourg

Effect of chronic renal failure on the hepatic, intestinal, and renal expression of bile acid transporters

Gai, Zhibo ; Chu, Lei ; Hiller, Christian ; Arsenijevic, Denis ; Penno, Carlos A. ; Montani, Jean-Pierre ; Odermatt, Alex ; Kullak-Ublic, Gerd A.

In: American Journal of Physiology - Renal Physiology, 2014, vol. 306, no. 1, p. F130–F137

Although the kidney is believed to play a minor role in bile acid (BA) excretion, chronic renal failure (CRF) has been reported to be associated with increased serum bile acid levels and alterations in BA homeostasis. The mechanisms for elevated BA levels are poorly understood in both clinical and experimental studies. This study was designed to examine the effects of naturally progressing CRF of...

Université de Fribourg

Cardiovascular and metabolic responses to tap water ingestion in young humans: does the water temperature matter?

Girona, M. ; Grasser, Erik Konrad ; Dulloo, Abdul G. ; Montani, Jean-Pierre

In: Acta Physiologica, 2014, vol. 211, no. 2, p. 358–370

Aim: Drinking water induces short-term cardiovascular and metabolic changes. These effects are considered to be triggered by gastric distension and osmotic factors, but little is known about the influence of water temperature.Methods: We determined, in a randomized crossover study, the acute cardiovascular and metabolic responses to 500 mL of tap water at 3 °C (cold), 22 °C (room) and...

Université de Fribourg

Cardio- and cerebrovascular responses to the energy drink Red Bull in young adults: a randomized cross-over study

Grasser, Erik K. ; Yepuri, Gayathri ; Dulloo, Abdul G. ; Montani, Jean-Pierre

In: European Journal of Nutrition, 2014, p. 1–11

Purpose: Energy drinks are beverages containing vasoactive metabolites, usually a combination of caffeine, taurine, glucuronolactone and sugars. There are concerns about the safety of energy drinks with some countries banning their sales. We determined the acute effects of a popular energy drink, Red Bull, on cardiovascular and hemodynamic variables, cerebrovascular parameters and microvascular...

Université de Fribourg

Sitting comfortably versus lying down: Is there really a difference in energy expenditure?

Miles-Chan, Jennifer Lynn ; Sarafian, Delphine ; Montani, Jean-Pierre ; Schutz, Yves ; Dulloo, Abdul G.

In: Clinical Nutrition, 2014, vol. 33, no. 1, p. 175–178

Background and aims: Energy expenditure (EE) during sitting is widely assumed to be higher than that while lying down, but supporting evidence is equivocal. Despite this, resting EE in the sitting position is often used as a proxy for basal metabolic rate. Here we investigate whether EE differs in the comfortable seated position compared to supine (lying) position.Methods: EE and respiratory...