A non-therapeutic method for assisting a person to control weight of the person that includes receiving, by a programmed computer system, input data, calculating, in real-time, by the programmed computer system, at least one actual RCV(t) value over a period of time based, at least in part, on the food data of the input data and stored food data; calculating, in real-time, by the programmed computer system, at least one potential RCV(t) value over a period of time; displaying, in real-time, by the programmed computer system, at least one first graphical indicator representative of the at least one actual RCV(t) value over the period of time; and displaying, in real-time, by the programmed computer system, at least one second graphical indicator representative of the at least one potential RCV(t) value over the period of time.
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