The Center for Science in the Public Interest says that practically all of Ben and Jerry's 53 flavors have processed substances in them, which undercuts the brand's claim to the word "natural" on its labels. Here's more detail from Crop to Cuisine:

At least 48 out of 53 flavors of Ben & Jerry’s “All Natural” ice cream and frozen yogurt contain alkalized cocoa, corn syrup, partially hydrogenated soybean oil, or other ingredients that either don’t exist in nature or that have been chemically modified. Calling products with unnatural ingredients “natural” is a false and misleading use of the term, according to the Center for Science in the Public Interest. Today, CSPI urged Ben and Jerry’s to drop the claim or else the nonprofit watchdog group will take its concerns to the Food and Drug Administration and state attorneys general.

Ben and Jerry's, of course, has long enjoyed a reputation for purity, which was certainly more deserved in the product's early days, when actual people Ben and Jerry were in charge. But they sold the brand to Unilever, and, no doubt, the conglomerate found cheaper substitutes that were "just as good."

That's fine, I guess: They bought it, they own it, they can do whatever they want. 

Well, almost. They can't keep calling it natural, a label that is pretty meaningless but still apparently has consumer cachet.

Here's a link to the center's notice, also courtesy of C2C.