The practice of starving hens for profit is known as forced-molting. Molting literally refers to the replacement of old feathers by new ones. In nature, birds replace all their feathers in the course of a year to maintain good plumage at all times. A natural molt often happens at the onset of winter, when nature discourages the hatching of chicks. The hen stops laying eggs and concentrates her energies on staying warm and growing new feathers.

The egg industry exploits this natural process by forcing an entire flock to molt simultaneously. This is done to manipulate the marketplace and to pump a few hundred more eggs out of exhausted hens when it is deemed cheaper to "recycle" them rather than immediately slaughter them after a year of relentless egg- laying on a calcium-deficient diet.

To trigger the physiological shock of the forced molt, a University of California poultry researcher (Donald Bell) recommends the removal of all food for no less than five days and as long as fourteen days. Survivors may be force-molted two or three times, based on economics. At any given time over 6 million hens in the U.S. are being systematically starved in their cages, according to the U.S. Department of Agriculture. Dr. Peter Dun, an animal scientist from Scotland, said hens are force molted in the United States "until their combs turn blue."