Observations aside, there is actually scientific evidence to the contrary. The fact is that our bodies require certain types of fats (omega3, omega6, etc..) in order to function properly. Your body is built to break down fats, this is why you have a gall bladder. Diets low in animal fats (not ala omega3's and 6's, which your body has to break down and consequently only gets a very small percentage of usable omegas) cause the body to more easily synthesize fat from other sources, most notably carbohydrates. Diets high in carbs trigger leptin signaling surges which can cause averse reactions like your brain no longer receiving leptin signals. "In Framingham, Massachusetts, the more saturated fat one ate, the more cholesterol one ate, the more calories one ate,the lower people’s serum cholesterol. We found that the people who ate the most cholesterol, ate the most saturated fat, ate the most calories weighed the least and were the most physically active." [1].

If you want to have the best brain function (your brain is made up of mostly fats) and body function you should strongly consider cutting out gluten based foods (which interfere with so many things in a bad way [2]) and start eating grass fed and finished beef, and wild game with a side of veggies. Cut out as many tubers as you can get away with as well.

Foods that you cannot eat unless they are cooked are probably not the best for your diet, in my mind this makes perfectly logical sense. We are people of the ice age, our diets for many thousands of years consisted of what could be eaten raw, including meats. While we do not yet have a full understanding of the rate at which humanity evolves; it is understood that the core functioning of our bodies energy system can not completely change in the span of a few thousand years.

[1] Dr. William Castilli, "concerning the possibility of a nut...," archives of internal medicine [2] Journal: Neurology - Hadjivassiliou 2001