You eat less than 20g of carbs a day, moderate amount of protein 50-100g/day (60-75 is ideal for most people), and 100-150g fat/day. It is a high fat
diet that switches your body from using
carbs for energy to using fat for energy. After a few weeks adjustment to it, you will fill up faster, hardly ever feel hungry, and always have a ready source of energy (your body fat!). Google it! Tons of info out there and many facebook groups!