Having a high fat diet is essential for multi day long mile treks in my opinion. It's extremely hard to get the amount of calories I need otherwise. The average person probably burns 5,000-8,000 calories a day backpacking 20-30 miles. I definitely don't pack near that amount even with high fat foods. Your body processes mono and polyunsaturated fats more like carbohydrates than fats. I suppose if you were thinking of saturated fats then I'd agree, that is unappetizing. I more stick with trail mixes as stated above.