Sweet-inhibiting effects of gurmarin on intake during repeated acute and long-term sugar exposure: A behavioural analysis using an animal model

Excessive consumption of added sugars is linked to chronic diseases, such as obesity, diabetes, dyslipidaemia or cardiovascular disease; and public health is searching for new strategies to reduce it. Although plant-derived bioactive compounds with inhibitory properties of sweet taste like Gymnema sylvestre show the potential to reduce sugar intake acutely, their impact after repeated administration is unknown. Therefore, we examined the changes of single and repeated exposures of a Gymnema sylvestre constituent, gurmarin, in sweet beverage consumption and preference in a preclinical model. 24 Wistar rats (50 % females) were divided into experimental (gurmarin) and two control groups (gymnemic acids or phosphate buffer solutions) according to the substances orally applied. Then acceptance and preference tests with sugar were performed within (Experiment 1) and between sessions (Experiment 2). We found that administering gurmarin decreased sucrose intake significantly, even after multiple treatments, without rebound effects. These findings suggest that sweet taste suppressors could be an effective tool for reducing long-term sugar consumption when repeatedly administrated.