15g carbs are not too few. 20g is the most heard guideline but it is meant to be an upper limit. 20g is the amount specified in the Atkins Induction Diet. It is an amount low enough to induce ketosis in most people in about 3 days. It allows room to have several cups of low carbohydrate vegetables to have lettuce salads and low carbohydrate vegetable side dishes, like broccoli.
