Things we know:
- Titans were humans
- Titans live off of sunlight and that is the only thing they need to live
- They dont need to eat humans to survive
- They dont eat animals
So why eat humans?
My theory is because all they want to do is return to their human forms.
How do they return to their human forms? By eating a titan shifter and taking their powers. We know this because that is how Ymir became human again after becoming a titan. She as a Titan ate Reiner and Bertolt's childhood friend who was a titan shifter and became human again.
So all titans do is eat and eat humans until hopefully they find one who is a titan shifter and can take their powers and finally become human again.
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