Vaso Prime RX 2. Fat IS the body's ideal source of energy and when you are in ketosis you experience energy and mental clarity like never before and of course very rapid weight loss. If you eat too many carbs, you will not stay in ketosis, and the potential benefits of the diet, including weight loss, will be diminished. In order to get the most out of a ketogenic diet, you must eat high-fat foods and limit your carb intake to fewer than 30-50 grams per day. This is very common and most women experience it. Around week 2 or 3, weight loss seems to stop or stall for a couple of weeks. Want hard evidence of IF's possible weight-loss effects?