1. A process for heating a plurality of articles in a microwave heating system, said process comprising:(a) loading a group of said articles into a carrier, wherein each of said articles includes a package at least partially filled with at least one foodstuff, wherein at least a portion of said foodstuff in one or more of said packages is positioned near at least one energy control element;
(b) passing the loaded carrier through a microwave heating chamber in a direction of travel along a first convey line;
(c) generating microwave energy;
(d) during at least a portion of said passing, discharging at least a portion of the microwave energy into said microwave heating chamber; and
(e) heating said articles using at least a portion of said microwave energy discharged into said microwave heating chamber,
wherein, during said heating, the portion of the foodstuff positioned near said energy control element is heated to a different temperature or at a different heating rate than said portion of said foodstuff would have been heated to or at if said energy control element was not present.