In the low-calorie diet, the focus is entirely on the number of calories you eat. With this form of diet, you will structurally absorb too few calories. The idea behind this is that in this way the body is forced to burn body fat to meet its energy needs. This diet includes a nutritional scheme that should be kept as close as possible. If you do not like something on a specific daily menu, you can substitute the food with something similar that contains the same amount of calories.