Abstract: A test system and a method for producing a test signal for food tolerance analysis using a signal producing device (12), from which an electric signal may be produced at a defined frequency spectrum and may be electrically coupled with a sample (18) containing at least one sample substance, and with an output (23), via which the signal generated by the signal producing device (12) may be emitted when coupled electrically with the sample (18). The test system and method enable food tolerance analysis to be performed easily, safely and quickly.