The brain is a hungry device that consumes a lot of energy every day and can not work directly with fat. It can only work with glucose … or Keto diet In the Keto diet , your body completely changes its fuel supply to work mainly with fat, fat burning 24-7. When insulin levels are too low, fat burning can increase dramatically. It is easier to get to fat stores to get quemarlos.5 This is great if you are trying to lose weight, but there are other less obvious benefits like reducing hunger and a steady supply of energy. This can help you stay alert and focused.