Lard substitutes are similarly made from one or more of these fats, but are harder in texture and no attempt is made to give them a butter flavor by churning with milk.

All the fats used are wholesome and efficient sources of energy for the human machine.
In the absence of butter some other form of fat is desirable in the diet, because fat is so concentrated a food.

There is a limit to the capacity of the human stomach to hold food.

People who live on a diet largely of rice, which has almost no fat in its make-up, develop characteristically distended abdomens, because they have to eat such a great quantity of food to get fuel enough for their day's work.

When people are for any reason put on a milk diet for a considerable time it is customary to put something into the milk to make it more concentrated, for otherwise they would drink and drink and then hardly get fuel enough.