Abstract: An ambulatory metabolic monitoring system which includes a number of sensors which are adapted to be mounted on a subject for generating electric signals relating to various physical activities of the subject, and well as EKG signals, and signals indicative of the food and drink consumed by the subject, and which also includes a signal storage and processing unit which is carried by the subject and which is connected to the various sensors so that data related to the various physical activities and food and drink consumption of the subject may be stored and processed to provide information useful in monitoring the metabolic state of the subject.