Diet foods lack the nutrients that we need to stay. Our ancestors did not eat these type of foods and our bodies are not biologically programed to process them. Foe example, you would not find a cave man, removing the fat from a piece of raw meat. The human genome is over 144 billion years old and has not changed much. Therefore, we are basically cavemen and women trying to survive on food that is not useful to our bodies. The only reason we do this is because since food is plentiful for most of us, we have become complacent about its importance and so we can become subject to the diet dictocrats who have brainwashed us to believe that fat and animal protein, which are the most important nutrients are unhealthy.

http://naturalbias.com/12-reasons-why-saturated-fat-is-good-for-you/