I guess I wouldn't consider 15% virtually no fat.
I think 15-25% is a very healthy number. Also, each body is different, and has different needs. I was just emphasizing how fats are important and have many health benefits- for our brain and nerve functions, our immunity, longevity, skin, hair, nails, moods, hormones,etc.
I also eat a generally low fat diet, with a big focus on whole grains and vegis...but I try to get some "good" fat in every day.
I recently read a book that backs up this theory- it's about the Okinawa people (Okinawa is an island near Japan). The Okinawa are the healthiest, longest living people... there's been studies going on for them for quite some time... they seem to have the largest centurian population, as well as a very, very low incidence of disease. Their diet consists of a high percentage of whole grains and vegetables, with 2-4 servings of fruit per day, 2-4 servings of flavanoid foods (such as soy, flax, tea, legumes, cranberries, onions,applesauce), 2-4 servings calcium foods (broccoli, soy, dairy, spinach, kale), 1-3 servings omega-3 foods (flax, salmon, tuna, mackeral, nuts, olive oil, avocados), 1-2 Tbsp. vegetable oil daily, and optional- 0-7 servings weekly of poultry, meat, eggs and optional 1-3 servings weekly of sweets. It's definately not a fat-free diet, and I'm not sure if I'd call it low-fat, probably more like moderate fat... but it seems to work- they have an entire population to prove it!