The invention relates to a thermoregulated device for modifying the consistency of a starting composition that comprises a preparation at least partially mixed with a liquid. For this purpose the device is configured to accommodate a reservoir (3 203 303 403 503 603 703) containing the starting composition and possessing two opposing faces at least one of which comprises a flexible section the device comprising a thermoregulated element (2 202 302 402) having a predefined contact surface arranged to come into contact with one of the opposing faces of the reservoir (3 203 303 403 503) as well as stirring means for mixing the composition in the reservoir (3 203 303 403). The stirring means comprise a mixer (10 210 310 410) as well as driving means (30 230 330) arranged for running the mixer (10 210 310 410) bearing on said flexible section of the reservoir (3 203 303 403 503) when the reservoir is disposed on the thermoregulated element (2 202 302 402) of the device in such a way as to create a local compression zone (8 208 308) in the interior of the reservoir (3 203 303 403 503). The driving means (30 230 330) are also arranged to then displace the mixer (10 210 310 410) with respect to the flexible section of the reservoir (3 203 303 403 503) in order to displace said local compression zone (8 208 308) to the interior of the reservoir (3 203 303 403 503) in such a way as to mix the composition of the reservoir (3 203 303 403 503) during the mixing operation.
