I don't know about you, but if I eat too much high glycemic food, I get "I don't care, I don't care" running in my mind, and it's very hard for me to do things.

I've got akrasia problems anyway, but too much refined carbs makes it worse, and it took me quite a while to find out that the "I don't care" soundtrack wasn't just an emotional problem-- I was poisoned.

The other traps in this are that it's hard to remember that I need to eat more carefully if I'm knocked out, and the taste of sweetness does a good job of briefly cutting through the depressive haze.