“ We are indeed much more than we eat, but what we eat nevertheless helps us to be much more than we are.” A century ago our ancestors feared infectious and communicable diseases such as smallpox -- diseases that claimed many children’s lives and limited the average life expectancy of adults. Today far fewer infectious diseases threaten us, thanks to medical science’s ability to identify disease-causing microorganisms and develop vaccines. In developed nations, purification …showed first 75 words of 2223 total…

…showed last 75 words of 2223 total…people today, however, is far brighter than in the past. Some cancers are preventable, and many are curable, especially when they are detected early. Genetic, environmental, and dietary factors can play roles in cancer development. People who wish to reduce their cancer risks can reduce their exposure to environmental and dietary factors that have been linked to cancer. Among environmental factors, smoking, water and air pollution, and sun exposure are known to cause cancer (Whitney 662).