Inhaltsangabe: Abstract: An ounce of prevention is worth a pound of cure. Rarely are there any objections to this old proverb. Its significance is underscored by the fact that the Major causes of death today are the degenerative, chronic diseases of civilization. Abundant evidence has been accumulated that these diseases can often be prevented. However, the appeal of prevention lies not only in its ability to reduce suffering from disease but also in its assumed power to reduce the costs of health care. At first sight it appears that promoting health and preventing disease would easily...