Abstract: An insulated food storage system comprising a heat insulating base and a heat insulating cover together defining a cavity. A thermal plate fits within the cavity, the thermal plate having a chamber containing wax which solidifies in the temperature range 75.degree. C. to 95.degree. C. So that food located within the cavity together with the thermal plate is maintained substantially within that temperature range as the wax which has been previously heated and liquefied cools and solidifies. The wax in one embodiment is in a metal tray closed by a metal lid within the chamber in the thermal plate. The chamber is in a central region of the thermal plate and the edges have no wax within the space between the top and the bottom walls of the edges. A plastics material with very low thermal conductivity is used for the thermal plate.