The present invention provides compositions which comprise an extract with at least 5 % in weight of anthocyanins and an extract with at least 15 % in weight of phenylpropanoids which are specially indicated for their use in weight reduction periods because they reduce appetite and increase satiety though digestive tract-secreted hormones level modification. In a parallel and complementary way, these compositions act on the lipid metabolism of the adipose tissue cells by activating AMPK sensors and the fat oxidative and elimination pathways. Said composition is obtained by hydro-alcoholic extraction of Rosella flowers and Lemon Verbena leafs, using in the case of Lemon Verbena alcohol concentrations (ethanol, methanol, propanol, isopropanol or butanol) greater than 70 and up to 100 % in volume).
