When we think about healthy eating, many of us view it in regards to our personal health. However, we may need to view it in terms of a healthy environment as well. This week on “Take Care,” Dr. Walter Willett tells us the dangers industrially producing food can have on the environment, and why a sustainable diet should become a necessity. Willett is the chair of the nutrition department at Harvard University School of Public Health, and the Fredrick John Stare professor of epidemiology and