According to the NY TImes:
Every day, the nation’s cows produce an average of about 60 million gallons of raw milk, yet less than a third goes toward making milk that people drink. And the majority of that milk has fat removed to make the low-fat or nonfat milk that Americans prefer. A vast amount of leftover whole milk and extracted milk fat results.
For years, the federal government bought the industry’s excess cheese and butter, an outgrowth of a Depression-era commitment to use price supports and other tools to maintain the dairy industry as a vital national resource. This stockpile, packed away in cool caves in Missouri, grew to a value of more than $4 billion by 1983, when Washington switched gears.
You know that extra cheese pizza from Pizza Hut or Dominos? Guess where that cheese comes from…