Brain's counting skill 'built-in'

Except for counting Calories that is.

"Humans have an in-built ability to do mathematics even if they do not have the language to express it, a research team has suggested."

Which gives fat people a couple of choices to explain their condition:

1. They are not human. A reasonable argument in light of the fact that some weigh more than zoo animals.
2. They have no brains. Also reasonable.
3. Both of the above. Still reasonable.

You decide.