In essence, the ketogenic diet is a very high fat, very low carbohydrate diet
using ketones as a fuel source rather than glucose (sugar).
When the body is using
ketones as a fuel source, we say that person is in ketosis, and that's the ultimate goal of this diet.
The diet aims to create a glucose deficit in the body, allowing the liver to produce
ketones as fuel for metabolism.
Research has shown that mitochondria — those little power plants within your cells — actually
prefer ketones as fuel.
Animal and human studies have demonstrated that MCTs enhance thermogenesis and fat oxidation, thereby suppressing the deposition and accumulation of body fat.9 In other words, they have a heating effect, and your body can readily
use ketones as fuel for energy in lieu of carbs.
Many people will feel considerably fatigued during the first few weeks of ketosis — the body is trying to adapt to using
ketones as a fuel source.
Our brain loves to use
ketones as fuel that occur with the breakdown of fats, so MCT oil is a great start because it's readily absorbed in the brain.
In this process, your liver provides glucose for the few cells and organs in your body that can't use
ketones as fuel, such as your red blood cells and portions of the kidneys and brain.
Although the brain will adapt to using
ketones as a fuel, it preferentially uses carbohydrates and requires a minimum level of glucose circulating in the blood in order to function properly.
The brain is happy to use
ketones as a fuel, although they're rarely abundant enough.
Even in these rare population groups that can get into ketoacidosis (uncontrolled diabetics), BHB can actually be helpful for these individuals if they are using their medical insulin as it will help the body become more efficient at using
ketones as fuel.
Ketones as a fuel used by the body instead of carbs / sugar will help keep blood sugar levels stabilized, and be less corrosive to the nerve ending in the brain.
The main similarities in metabolism between LCDs and starvation are that there is no (or little) intake of exogenous carbohydrate and that there is a shift from the use of glucose as fuel toward the use of fatty acids and
ketones as fuel.