I have been trying to convince people that a lot of what we think we know about our diet and the affect it has on our bodies is wrong or at least mis-guided. Our ancestors ate fat, but didn’t become fat as a result and the main reason was that they didn’t eat that much carbohydrates. Our bodies have evolved to eat what was available, and to only put on stores of fat when carbohydrates were available.
I came across this info-graphic which helps explain the science behind why fat doesn’t make us fat. Also read Gary Taubes book “Good Calories, Bad Calories”
For the sources behind the info-graphic see the Massive Health blog