The comment in regards to "corn being like candy" refers to the way the chickens like the cracked corn. It doesn't refer to the nutritional value. I believe the original poster stated she/he was giving the corn as a treat, which was very appropriate.
Also, I maybe I should say that the cracked corn is good for winter because it provides energy. Not heat. Here's a few quotes:
4. Feed them corn in the evening to keep them warm all night.
Giving your chickens a nice feeding of cracked corn before bed gives them something to digest during the night, keeping them warmer. And they love it, and who doesn't deserve a little extra niceness during a long, cold winter?
The above was a tip from smallfarm.about.com. It was an article written by a small farms expert. So my thinking might not be what you want to hear, but it's what I've learned throughout my chicken keeping.
Share your opinions. You should feel OK with sharing your opinions. This is a happy site. Not a place to talk down to people.