why is eggman so fat

[perfect chaos]

he eats to much food

[Ioshyriku]

he eats a lot, the ep. of SonicX where Sonic can't stop running will explain this

[zReanimation]

hes filled with yolk...get it (egg)man.

[zune-the-hedgehog]

  he was thin remember how he became evil? he got zapped with the original chaos emeralds while holding an egg. (so the emeralds turn things fat maybe that is why sonic 2 and 3 sonic were fat you could use the emeralds all the time)