Please give at least one specific example of how Peeta changes through The Hunger Games.

You might like to think about how Peeta is presented in
Chapter Nineteen of this excellent novel, when Katniss finds him and takes him to the
cave and sees the full extent of his wound. When Peeta saved Katniss from being killed
by Cato, Cato wounded Peeta badly in his leg, and it is only in this chapter that
Katniss discovers just how badly Peeta is wounded. Given the nature of their environment
and the lack of medical supplies, the chances for Peeta are pretty slim. Peeta is
obviously changed by the reality of his situation. He recognises the way that he is
unlikely to survive the experience. This of course develops and matures him. Note how he
tries to raise the subject with Katniss, only to be interrupted every
time:

"Look,
if I don't make it back--" he
begins.

We can see the
acceptance that Peeta has of his death again in Chapter Twenty Five, when he insists
that Katniss kills him to win the Hunger Games, and then rips of his bandage to his
wound so that he will die. Peeta has so clearly changed from the young and innocent
young man who worked in the bakery and gave bread to Katniss so long
ago.