Inger, did you forget those fundamental? It’s not cooked foods in general that are most likely addictive, but milk, dairy and cereals — especially wheat.
http://www.ranprieur.com/readings/origins.html (http://www.ranprieur.com/readings/origins.html)
The origins of agriculture:
a biological perspective and a new hypothesis
by Greg Wadley and Angus Martin
Published in Australian Biologist 6: 96-105, June 1993
Pharmacological properties of cereals and milk
Recent research into the pharmacology of food presents a new perspective on these problems.
Exorphins: opioid substances in food
Prompted by a possible link between diet and mental illness, several researchers in the late 1970s began investigating the occurrence of drug-like substances in some common foodstuffs.
Dohan (1966, 1984) and Dohan et al. (1973, 1983) found that symptoms of schizophrenia were relieved somewhat when patients were fed a diet free of cereals and milk. He also found that people with coeliac disease -- those who are unable to eat wheat gluten because of higher than normal permeability of the gut -- were statistically likely to suffer also from schizophrenia. Research in some Pacific communities showed that schizophrenia became prevalent in these populations only after they became 'partially westernised and consumed wheat, barley beer, and rice' (Dohan 1984).
Groups led by Zioudrou (1979) and Brantl (1979) found opioid activity in wheat, maize and barley (exorphins), and bovine and human milk (casomorphin), as well as stimulatory activity in these proteins, and in oats, rye and soy. Cereal exorphin is much stronger than bovine casomorphin, which in turn is stronger than human casomorphin. Mycroft et al. (1982, 1987) found an analogue of MIF-1, a naturally occurring dopaminergic peptide, in wheat and milk. It occurs in no other exogenous protein.
http://disinfo.com/2010/10/the-addictive-opioids-in-wheat-and-dairy-foods/ (http://disinfo.com/2010/10/the-addictive-opioids-in-wheat-and-dairy-foods/)
The Addictive Opioids In Wheat And Dairy Foods
Wheat- and dairy products contain opioid peptides influencing endorphin receptors in the brain. These peptides are physically addictive, causing dependence, asthma, obesity, apathy, ignorance and numbness.
http://www.nutramed.com/eatingdisorders/addictivefoods.htm (http://www.nutramed.com/eatingdisorders/addictivefoods.htm)
Pieces of milk and wheat proteins (peptides) can act like the body's own narcotics, the endorphins, and were described by Zioudro, Streaty and Klee as "exorphins" in 1979. Other food proteins, such as gluten, results in the production of substances having opiate- (narcotic) like activity. These substances have been termed "exorphins." Hydrolyzed wheat gluten, for example, was found to prolong intestinal transit time and this effect was reversed by concomitant administration of naloxone, a narcotic-blocking drug. Digests of milk proteins also are opioid peptides. The brain effects of exorphins may contribute to the mental disturbances and appetite disorders which routinely accompany food-related illness. The possibility that exorphins are addictive in some people is a fascinating lead which needs further exploration