[phonypc]

Define low.

Unless you're a competitive body builder on show day, you've probably got enough fat to cover a few weeks worth of energy needs.

[rossenberg79]

12% is not that low, but hardly weeks worth of energy needs.

[phonypc]

12% fat on a 150 pound person is good for about 63000 kcal. 31 days at 2000 kcal per day.