A food safety system for food items in cooled environments comprising: - a cooler (10, 10', 130) comprising a plurality of predefined food item positions - a temperature sensor unit comprising a temperature sensor, a power supply, a data transmission element and a control unit, wherein the temperature sensor unit is positioned at a predetermined position in the cooler (10, 10', 130), - a control center unit having a computer processor and a memory, wherein the memory data in the control center comprises a database of heat transfer parameters (h cl,fp) depending on the type of cooler (10, 10', 130, cl) and on the predefined food item positions (fp) in said type of cooler (10, 10', 130, cl), as well as values for food specific coefficients (Q ft) related to the kind of food item taken from a group of food types (ft), wherein the control center is adapted to execute a deterministic mode function predicting the core temperature change of a food item on a predefined food item position in said cooler (10, 10', 130) according to: dTc cl, fp, ft t dt = f h cl, fp, Q ft, Te cl, Tc cl, fp, ft wherein the deterministic mode function f depends on the stored cooler specific heat transfer parameters (h cl,fp) related to the type of cooler and to the predefined food item position in the cooler (10, 10' 130) used, stored food specific coefficients (Q ft) related to the kind of food item taken from a group of food types, the environment temperature (Te) measured by the temperature sensor and the predicted current core temperature (Tc) of the food item, wherein the control center is connected to an alarm server and is further configured to, when the control center determines that an incident happens when the predicted core temperature of a food item rises beyond a temperature threshold for this food item, to give an alert by automatically calling a predefined electronic communication device transmitting the information of this incident at the monitored cooler (10, 10', 130) in question identified by the temperature sensor unit. - a cooler (10, 10', 130) comprising a plurality of predefined food item positions - a temperature sensor unit comprising a temperature sensor, a power supply, a data transmission element and a control unit, wherein the temperature sensor unit is positioned at a predetermined position in the cooler (10, 10', 130), - a control center unit having a computer processor and a memory, wherein the memory data in the control center comprises a database of heat transfer parameters (h cl,fp) depending on the type of cooler (10, 10', 130, cl) and on the predefined food item positions (fp) in said type of cooler (10, 10', 130, cl), as well as values for food specific coefficients (Q ft) related to the kind of food item taken from a group of food types (ft), wherein the control center is adapted to execute a deterministic mode function predicting the core temperature change of a food item on a predefined food item position in said cooler (10, 10', 130) according to: dTc cl, fp, ft t dt = f h cl, fp, Q ft, Te cl, Tc cl, fp, ft wherein the deterministic mode function f depends on the stored cooler specific heat transfer parameters (h cl,fp) related to the type of cooler and to the predefined food item position in the cooler (10, 10' 130) used, stored food specific coefficients (Q ft) related to the kind of food item taken from a group of food types, the environment temperature (Te) measured by the temperature sensor and the predicted current core temperature (Tc) of the food item, wherein the control center is connected to an alarm server and is further configured to, when the control center determines that an incident happens when the predicted core temperature of a food item rises beyond a temperature threshold for this food item, to give an alert by automatically calling a predefined electronic communication device transmitting the information of this incident at the monitored cooler (10, 10', 130) in question identified by the temperature sensor unit.