RSS or Atom feeds are useful to keep your readers informed about the latest news. And it could also be used to keep visitors coming again and again to your blog. A simple way optimize feeds is to let the visitor read only the first or two paragraph of the post. That way people will have to visit your blog to read the full article, and thus your traffic will be improved.
To enable short blog feeds, open Dashboard > Settings and choose 'Site Feed' tab. Choose 'Short' in 'Allow Blog Feeds'. Scroll down and Save your setting.