What is ketosis/ketosis? If you eat a few fast carbohydrates, your body will fall into ketosis. This means that your body starts to draw energy from fats instead of glucose. This considerably increases the fat burning of the body. More and more diets are based on this principle because of the exceptionally high weight reduction and the feeling of satiety. Unlike traditional diets, ketosis-based diets are not about limited calorie intake and calorie counting. You can almost eat what you want … or rather … what you can eat. And despite losing unlimited food, losing weight.