Buttermilk Skim Milk by Paramhansa Yogananda
HEALTH CULTURE
BUTTERMILK and SKIM MILK
Buttermilk contains all the elements of whole milk except the butter fat. Besides this, buttermilk contains lactic acid which gives it its special-flavor, makes it easier to digest and protects it from harmful bacteria. When buttermilk is served as a beverage, butter should also be eaten at the same meal in order to obtain all the health-giving elements of whole milk.
Skim milk may also be used as a substitute for whole milk, if butter is served, for it too includes all of the properties of whole milk except butter fat.
Praecepta Lessons, Volume 3 (1938): Praeceptum #73