The fat content was 50%, which is much higher than the 10% in the average modern diet. "If you consider the altitude where the Iceman was hunting, you need this kind of energy supply," said Dr Frank Maixner of the Eurac Research Institute for Mummy Studies in Bolzano, Italy. "And the best way to do this is by eating fat; this gives you the necessary energy to survive in this harsh environment."

Yep,best way to do it.