Fluffernutter requisites

I notice the following:

<td>
  Natural peanut butter made with peanuts, salt, and nothing else:
</td>
<td>
  Total fat: 16g
</td>
<td>
  Saturated fat: 2g
</td>
<td>
  Sodium: 120mg
</td>

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