Atkins says quite explicitly in his book that you do not need to count calories. Eat until you are full and then stop, but make sure you eat at least every six hours when you are awake, even if you are not hungry. If you limit your carbohydrates to 20 grams a day and don't try purposefully to make your food lowfat, you should get enough fat in your diet. Learn to cook with butter and olive oil -- it will make your food taste better and ensure that you get enough fat in your diet!