Fat is flavor. A saying in the restaurant industry.
Our tastebuds evolved over 15000 years or so to enjoy the taste of fat due to its high and dense nutrient value and ability to give us energy. Food was scarce back in a day before farming when we were hunter gatherers. So we needed a lot of energy to move about this beautiful world we call home to run down our prey and cover large amounts of distance to get to where the food grew. Foods with high amounts of fat are good for this kind of life style because they would give us the energy we needed to continue to live so biology decided, might as well give us a positive signal to the brain when we eat it as a reward.
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