There is no longer any doubt that human behavior is a factor in many health-related issues that humankind must endure. It is clear that smoking, diet, and physical activity all have a causal relationship to heart disease, the number one cause of death in the United States. For more than 40 years, evidence has been accumulating that cancer, the number two cause of death in this country (soon to surpass heart disease in that regard), has those same lifestyle factors as the etiological factors for many diseases classified as “cancer.” Because diet and physical activity have such a bearing on one's weight, the accumulation of excess body fat is one lifestyle-related factor that has become of major significance in the development of certain cancers and ...

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