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.
