There are no humans who have no body fat!

 A person's body fat percentage is the total weight of the person's fat divided by the person's weight and consists of essential body fat and storage body fat. Essential body fat is necessary to maintain life and reproductive functions. The percentage for women is greater than that for men, due to the demands of childbearing and other hormonal functions. Essential fat is 3–5% in men, and 8–12% in women^[1].
http://en.wikipedia.org/wiki/Body_fat_percentage

If you think you need to get rid of even your essential fat, as anorexics usually do, damn man, you're actually killing yourself! You'd better check the facts before you die! Don't blame me cause I told you!

Hey celebs who think you are role models for little kids and teens (Emancipated and well-educated grown-ups don't need anyone to tell them what to do!) stop making such false statements such as "I have no body fat!" for christ's sake! If that was the truth, you could not keep your body upright and sell us these lies.
I'm not buying! Ha!

 http://en.wikipedia.org/wiki/Famine