I get physical dependence on sugar. My other comment in this thread details it a bit. If I eat sugar regularly I get small sinus headaches that are unpleasant, but bearable. When I cut it out I go into full withdrawal. I recognize that the literature doesn't support this and I would happily undergo studies to back it up. I have gone through this process multiple times and I get sick consistently (I no longer eat sugar because of this).

I might be an anomaly due to an autoimmune disorder, but we may need to start putting an asterisk that sugar is not addictive *for most people.