Food addictions are not strictly "psychological" problems, but have a hard-wired, organic component. Many of the most commonly consumed foods in Western culture actually contain narcotic properties associated with the presence of psychoactive chemicals that bind to opioid receptors in the nervous system. These peptides are so powerful that researchers block their action with drugs such as naltrexone which is used to treat addiction among heroin abusers, and naloxone which is used to prevent death from heroin overdose.

These "food opiates" are heavily concentrated in wheat and dairy products, especially cow’s milk. Wheat contains the following opioid peptides, known as gluten exorphins, alongside which are listed their amino acid structure:

Gluten exorphin A5: H-Gly-Tyr-Tyr-Pro-Thr-OH
Gluten exorphin B4: H-Tyr-Gly-Gly-Trp-OH
Gluten exorphin B5: H-Tyr-Gly-Gly-Trp-Leu-OH
Gluten exorphin C: H-Tyr-Pro-Ile-Ser-Leu-OH
Gliadorphin: Tyr-Pro-Gln-Pro-Gln-Pro-Phe
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http://www.greenmedinfo.com/blog/do-hidden-opiates-our-food-explain-food-addi...