And the things that are different -- emulsifiers, stabilizers, natural/artifical flavors, etc. -- aren't actually making the product unhealthy, at least not in any way that causes weight gain. Those aren't sugars, fats, or salt. They're just making it last longer on the shelf, and have more flavor. But it's not changing the nutrition, and it's not making us eat more of it.
You really think Chips Ahoy is making you fat in a way that grandma's chocolate chip cookies don't?