Mark:
From the standpoint of avoiding obesity and that of nutrition, give me a Woolworth's egg salad sandwich and a glass of milk any day, as opposed to something like a Wendy's Baconator or Burger King Whopper with supersize fries and a biggie soft drink.
While neither extreme would represent optimal nutrition, the 1960 Woolworth's choice was better than today's. I know that salads and whatnot are available at today's burger joints, but how many of their customers do you actually see having the salad and nothing else, or the salad instead of the fries? Precious few.
Fast food wasn't always the way it is now; I remember McDonald's back in the '60s, when you had one of their little hamburgers (the one almost no one orders today), a small serving of fries (no one stops at that today, either), and an 8-ounce serving of Coke (not enough to wet anyone's whistle now). Many fewer calories and far less fat than today's beef-bacon-and-cheese extravaganzas. Plus, back then, fast food was something of a treat - you didn't eat it every day, or even every week. It was considered an indulgence, which in my view, was the correct view.
By the way, I don't know about every Woolworth's, but the ones here in Atlanta had plated meals available in addition to the fountain menu. You could get something like chicken or ham or Salisbury steak as an entree, plus a choice of veggies. You'll play hell finding that kind of solid, traditional hot lunch today.