Early hominids/humans did not eat a low-fat diet because it was inherently good for them. (And just who was around telling tem that, anyhow?)
Apparently
http://www.hsph.harvard.edu/nutritionsource/low-fat/ it's more the type of fat that you consume that relates to differing health outcomes.
The new boogeyman is transfats.
http://www.bbcgoodfood.com/howto/guide/truth-about-low-fat-foods Low fat/high carb is out. High carb/low fat will kill you if it does not save you. Low fat/low carb/high protien will kill you but with more pain to be endured. If we had four stomachs and nobody minded all that methane we too could extract sustenance from vegetables (the stuff that food eats).
Based on decades of scientific evidence (I like it, it has not killed me yet) I propose that we all go on a diet based on The Brown Food Group: Chocolate, cooked (not burned past recognition) meat, browned potatos, caramelized onions, sauteed mushrooms, and cola drinks. Roughage in moderation (no more than a quarter-lettuce wedge with bleu cheese dressing, cooked cabbage with corned beef because Tradition) to help things along. Fermented/distilled spirits as necessary to break up anything that should not have clumped together.
stay safe.
