Marion Nestle — American Scientist

Marion Nestle, Ph.D, M.P.H., is the Paulette Goddard Professor of Nutrition, Food Studies, and Public Health at New York University. She is also a professor of Sociology at NYU and a visiting professor of Nutritional Sciences at Cornell University... (wikipedia)

Healthy, sustainable food production methods give us food that is nutritionally better and with fewer pesticides, antibiotics, and hormones.
I follow my own advice: eat less, move more, eat lots of fruits, vegetables, and grains, and don't eat too much junk food. It leaves plenty of flexibility for eating an occasional junk food.
I don't define anything I eat as a vice.
How we grow food has enormous effects on the environment - climate change as well as pollution of air, water, and soil.
The best way to eat is to eat lots of different kinds of foods. Except for breast milk, no one food is perfect.