First things first: Ketosis is a chemical reaction in your body that helps it burn more fat. It’s the core mechanism driving the popular keto diet.
By seriously limiting carbohydrates in your diet, you force your body to find other energy sources like ketones—chemicals produced from metabolized fat in your liver.
It usually takes between two and four days for your body to reach ketosis, but that’s assuming you follow a super-low carb plan. The minute carbs go up, ketosis stops.
Some studies suggest your metabolism increases and you burn slightly more calories in ketosis—anywhere from 50 to 200 extra calories a day.
People with type 2 diabetes, epilepsy, and Alzheimer’s disease may also see improvements in their condition due to ketosis and the keto diet.