iOS7 has real multitasking and automatically updates your apps in the background. Cool, but it may also result in ...
Poor Battery Life...
Here is how to disable background app refresh for those apps, that you dislike anyway:
Go to the Settings.app
... and go to "Background App Refresh"
Disable those apps, that you don't use that much. Or disable Background App Refresh for all apps, in case your battery life is really bad.