I wish more and more that health were studied half as much as disease is. Why, with all the endowment of research against cancer is no study made of those who are free from cancer? Why not inquire what foods they eat, what habits of body and mind they cultivate? And why never study animals in health and natural surroundings? Why always sickened and in an environment of strangeness and artificiality?

Threescore: The Autobiography of Sarah N. Cleghorn (ed. 1936)