Devices, methods, and systems for modulating a user's personal health are presented. In one aspect, a device containing a sensor is configured for tracking, measuring, and modulating a characteristic is provided. In certain instances, the characteristic to be measured pertains to food consumption. A personal health modulating device for communicating health modulating data with a mobile computing device is presented. The mobile computing device includes at least one electronic data input for receiving electronic data, at least one wireless transceiver for communicating with a wireless network, and an interactive display. The personal health modulating device includes a wearable unit configured to be worn on a part of a user's body, the wearable unit having one or more sensors to sense an environment of the user, to gather data representing one or more attributes related to an activity of a user within the environment, the data being selected for processing according to one or more personal health modulating data processing routines, the wearable unit further having a transmitter to transmit the data to the at least one electronic data input of the mobile computing device.