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Translations: Bleach 595 (2)
Wikipedia defines eating as 'the ingestion of food or other object, usually to provide heterotrophic organism particularly for energy and growth.' Maybe some of the Titanized humans rely on some source of energy, but by no stretch of the imagination do they need any kind of food in order to survive. We've seen what happens when they eat human flesh: it just stays in their body, and when there's no room for it anymore, they just start regurgitating it.
So why do Titans manifest the behavior of 'eating' human flesh? Well, in the past, I was totally puzzled by that question, but I believe the answer's been given to us in one of the recent chapters, through that conversation between Ymir and Berthold about Ymir's past. Out of that conversation, we can come to two inferences: first, when humans get turned into mindless Titans, there's still some part of their body that remains somewhere in there, and they are still conscious to a certain extent, although they have obviously no control of their actions; and secondly, through a process that involves a mindless Titan literally ingesting the body of a Titan-shifter, the former can acquire the latter's power and regain control of his body.
Now, based on this, here's my theory:
I believe that, at the start, there were at least two people at war with each other. One of them somehow developped what we know as the Titan's power, and then made two variants of it: one that would not only render their enemies powerless, but also turn them against their own people, by transforming them into mindless Titans that are programmed to try and 'eat' humans; and another much more powerful variant that would allow them to empower their own people and turn them into weapons of war (aka the Titan-shifters).
However, later, someone else acquired that Titan's power and turned it against its creator, by altering it so that people who would be turned into mindless Titans would be able to steal a Titan-shifter's power through a process that would involve ingesting his body.
I know it's somewhat far-strected, but there are two things that make me believe this.
First, we know from the anime that the world outside the walls is a war-torn one, and that the first generation of people who came to the world within the walls were lead by a bunch of religious, well-off men who wanted to establish a war-free society. Furthermore, it was said that the walls had been created using the Titan's power prior to the arrival of the people there, which implies that the Titan's power existed long before that.
Secondly, we know from both the anime and the manga that the society in which RBA live seems to be a typically ruthless, warfare-oriented one, in which people start training for fightning at a young age and fight all their life.
Based on that, I believe that the people living outside the walls have been at war and fightning each other using the Titan's power for a very long time, possibly for centuries before the start of the story. And it's easy to imagine how having the Coordinate's power would allow RBA's people to turn the tide of that war/conflict that they're in.
Anyway, tell me what you guys think. This is my theory on why Titans try to 'eat' people even though they get seemingly no benefit from doing so, based mostly on that conversation between Berthold and Ymir about the latter eating the former's friend who was most likely also a Titan-shifter.
Well Titans are ( from what we know so far ) type of biological weapon.
Their purpose is to kill Humans until there are none left, that's pretty much it.