Fluffernutter requisites

I notice the following:

Jif “low fat” peanut butter: Natural peanut butter made with peanuts, salt, and nothing else:
Total fat: 12g Total fat: 16g
Saturated fat: 2.5g Saturated fat: 2g
Sodium: 250mg Sodium: 120mg

Now, why would I want to buy the “low fat” peanut butter packed full of chemicals?