The use of different hydrocolloids at different concentrations in the formulation of semi-solid snacks makes it possible to obtain equi-caloric products with very different flow behaviour and viscoelastic properties. The expected satiety delivered to consumers by these equi-caloric semi-solid snacks varied considerably depending on the rheological profile of the product. Viscosity rather than elasticity determined the expected satiety elicited by the semi-solid snacks, so hydrocolloids with thickening capacity (more important than gelling capacity) are appropriate for increasing the expected satiety delivered by the product.