You know what? I don't eat junk. And the reason is, I don't
want junk! You couldn't pay me to eat McDonalds, Wendy's, Burger King, Pizza Hut, Domino's, etc. My taste has changed over the years since I stopped doing that and calling it "fun." That and checking a calorie chart...
I go to Starbucks now and then, and I get a grande iced coffee, no sweetener, and put whole milk and some half-and-half in it. That is my idea of a splurge! I really enjoy it, too!
My rule is, if I'm going to eat something like french fries, they have to be the best french fries on the planet, made with whole potatoes, with the skins on. They aren't going to be synthetic, modified food starch extruded into a french fry shape and carrying 250 calories of mostly fat in a small serving!
So I guess the answer to "how often" is--it's always an option! But not one I care to take! That's why it's a lifestyle change...
Jay