A system for monitoring stomach fullness includes an ultrasound transponder configured to transmit ultrasound signals and receive reflected ultrasound signals. A processor is configured to process the received reflected ultrasound signals to determine level of stomach fullness and output fullness data indicative of the determined level of stomach fullness. A memory stores calibration data representative of calibrated levels of stomach fullness including empty and full. A stored program has executable codes to, upon execution, control the ultrasound transponder, compare the fullness data against the calibration data, and output alert data upon a match of a preset fullness level.
