An acquaintance I once met, that used to work on the product design team for one of the major brands of snack/potato chips makers, had a witty response to what a friend asked, along the lines of:
"so, tell us, how can you work at something that you know is bad for people's health?" and he answered:
"I am certainly used to the opinion that garbage food is bad for your health, and what I think is that garbage food does NOT exist. What it actually DO exist are garbage diets. If you eat one bag of chips every now and then, nothing bad will happen to you. However if you eat one bag a day for 10 years, you will probably feel the effects."
So the bottom line is as usual, everything in moderation. I mean, the often used analogy is with water. You can't live without drinking it and yet you can certainly die if you drink too much of it.
Isn't this like an overdone debate? I mean, you can definitely start an alarmist attitude towards almost anything you can think of, no?