Matrix-forming composition containing pectin

−1 One aspect of the present invention relates to a liquid edible composition with a pH of more than 6, a viscosity below 600 mPas at a shear rate of 100sand 20° C., and a viscosity of at least 125% of the aforementioned viscosity at a pH below 5 and a temperature of 37° C., the composition comprising at least 0.05 wt. % of pectin having a degree of methoxylation between 2 and 50 and/or of alginate; at least 5 mg calcium per 100 ml; and at least 0.1 wt. % indigestible oligosaccharide having a degree of polymerisation between 2 and 60.Another aspect of the invention relates to a method for the treatment or prevention of overweight or obesity in mammals, said method comprising the enteral administration to a mammal of an effective amount of the aforementioned composition.