Why do people crave milk?

Some people crave milk due to the opiod peptides contained in dairy products. Opiod peptides represent what are known as amino acid sequences. Opiod peptides impact the brain in a manner similar to opiates, like OxyContin and heroin.

Opiod peptides in milk target endorphin receptors, leaving a person feeling good. The manner in which the opiod peptides in milk interact with endorphin receptors renders this and other dairy products semi-addictive. Researchers surmise that this attraction is designed to draw infants to consume milk in order to maintain their heath. The semi-addictive quality of milk does not dissipate as a person ages.