Abstract: An autonomously operated automated food dispenser provides sustenance to one or more animals at prescribed intervals. The dispenser is portable and suitable for use for animals in space vehicle life support systems. A micro-controller controls operation of the outlet valve of a food reservoir that contains a food paste maintained under pressure by a pressurized gas source. Predetermined volume of food paste are extruded through the outlet upon the micro-controller's command. The food cannister is characterized by a novel two part assembly and houses a rolling diaphragm. Pressurized gas is applied to the bottom of the diaphragm, allowing the diaphragm to roll against the food paste, when the outlet valve is opened.