How much fat in your diet is not enough? I know it's an important part of the diet, focusing on poly and mono and not saturated fats. All of the information I can find talks about not getting too much, no more than 30% of your daily calories, but how little is not enough? I know too little fat can do terrible things to your skin, hair, immune system, but I can't seem to find the info that says eat at least this much but no more than the 30%.