The Weston A. Price Foundation's Campaign for Real Milk explains in the article "What Is Real Milk?," available on its website (accessed Aug. 15, 2011):

“Pasteurization destroys enzymes, diminishes vitamin content, denatures fragile milk proteins, destroys vitamins C, B12 and B6, kills beneficial bacteria, promotes pathogens and is associated with allergies, increased tooth decay, colic in infants, growth problems in children, osteoporosis, arthritis, heart disease and cancer…

Pasteurization was instituted in the 1920s to combat TB [tuberculosis], infant diarrhea, undulant fever and other diseases caused by poor animal nutrition and dirty production methods. But times have changed and modern stainless steel tanks, milking machines, refrigerated trucks and inspection methods make pasteurization absolutely unnecessary for public protection.”

Aug. 15, 2011