And not to forget our hormones. Every single ex hormone is synthesized by fat. Check this out
Cholesterol –> pregnenolone –> androstenedione –> testosterone !
This is why following a low-fat, low cholestrerol diet can be very harmful. Carbs, on the other hand, deplete you hormones. It has been shown that increasing your fat consumption from 25% (mostly unsaturated) to 40% (mostly saturated) will increase testosterone. One other important hormone is leptin, which helps regulate satiety is also built from saturated fat and cholesterol.