There are very important and practical issues raised by following this alternative route which says, lets look to material conditions, to the systems of production, to the needs that human beings have, and to competing alternative solutions to the satisfaction of those needs.

Pigs eat grass if they are very hungry, but they can't use it as a regular source of food.

Food, like sex, is one of the principal kinds of human activity that engage people when they wonder about how to account for different kinds of human behaviour.

When a woman gives birth to a child, the child needs to be able to digest the mother's milk; but when this child is old enough to begin to eat other foods, there is some switching off of this ability to consume milk.

Like most North Americans, I'd been raised on the notion that milk is the first food, and everybody must like it because it's so good and so important for growing up and for being healthy.

Now we are in a situation in which for a significant part of the industrial world too much could become a danger, especially too much of the things which are really not good for us in such large quantities.

Pigs prefer to wallow in clean mud, but if nothing else is available, they will frequently wallow in their own urine, giving rise to the notion that they are dirty animals.