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I'm currently only watching the anime. I hardly read the manga but I'm very curious as to how humans become titans. Is it by some kind of drug similar to the one Eren was injected with by his father?

кяαzєя
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    Try to ask single question at time and for how humans became titan ,there are some question related to it , you might get answer but with spoiler and about Anne's try to ask those question separately – mirroroftruth Aug 04 '15 at 11:03
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    Also you could try to change a little bit the question in general, because you are saying "Attack On Titan - Female Titan" but you are interested about how any human became a titan. Maybe it could be like "How humans became titans?" – pap Aug 04 '15 at 11:13
  • I edited your question so that it only asks the first real question you asked. – SWard Aug 04 '15 at 11:32

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This contains major unmarked spoilers if you've only watched the anime, as will the linked questions.

In Eren's case, it's through a particular serum that his father injected into him just after the fall of Shiganshina, shown in chapter 71 of the manga. This serum was stolen from the true royal family by Eren's father, and is used to allow the subject to turn into a titan. As well as Eren, Rod Reiss is also shown as being able to transform after he has some of the serum:

"...he himself scrounges the fluid off the floor[...]. After ingesting it, he turns into a gigantic Titan considered by Levi and Armin to be bigger than the Colossal Titan."

Rod Reiss on the SnK Wiki

Certain humans that are also 'titan shifters' seem to have this ability inherently, or at the very least, it hasn't been covered as to where they gained it - this includes the likes of Annie, Reiner and Bertholt.

Additionally, if a titan shifter is eaten, a titan with a human inside will gain the ability to shift between two forms. This is evident in the case of Ymir, discussed in this question.

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Matt
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  • I think you might want to cut off the second part of your answer. – nhahtdh Aug 04 '15 at 12:15
  • @nhahtdh Thanks for the notice, I wouldn't have seen the edit for a while if not – Matt Aug 04 '15 at 12:23
  • Titan shifters are still titans, just in their human form, so they don't really *turn* into titans anymore, they just *morph*. As far as I remember, the serum is the only way to turn humans into titans. – Peter Raeves Aug 04 '15 at 18:00
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    Ow and when you (or Rod Reiss) say *eat*, you mean more accurately "Bite through his spine. It's enough just to ingest his spinal fluid". I love that quote and you also read more about this [here](http://teetanjaeger.tumblr.com/post/122949092597/on-cerebrospinal-fluid-spinal-cords-and-titan). Not that I actually read the blog post, but it seemed interesting and relevant. – Peter Raeves Aug 04 '15 at 18:02