It seems like a lot of addicts and alcoholics will crave sugar when they don't have their doc. I googled and came up with this...
(an excerpt) "Sugar addiction has long been joked about. Most researchers, however, believed you could not get hooked on sweets and lose control over consuming them, as if they were drugs. Now studies compiled over the years are making some scientists revisit the idea. The results do not indicate that donuts are in the same category as addictive drugs like heroin, alcohol or nicotine. They do suggest that some brain actions and characteristics associated with the intake of sweets and drug addiction may overlap."
http://www.sfn.org/index.cfm?pagenam...sugarAddiction