They actually do bother to explain that in the canon. Basically, all resources (COG Definition: Food, Water, [I]Women[/I]...) are diverted to the Gears. For reasons that should be obvious, they don't delve into that in the games.
English
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That's why civilians are so scrawny...sad..
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Would you want scrawny people fighting Locust? A normal Drone is built like a mountain.