I've personally seen many people over the years which actually lead a much healthier (and athletic) life living on a high fat and low carb diet (known as ketogenic). I never even stated that fats were preferred by the body either, by the way, that was an assumption you made. You can even eat high fat and low carb while on a 100% veggie diet (tofu, avocados, nuts, to name a few)! In fact, a limited carb diet is preferable for those with certain conditions such as diabetes since it prevents spikes in blood glucose.