Ketosis is a metabolic state where the body burns fat for energy instead of sugar.
Some people try to reach ketosis by avoiding carbohydrates in their diet, but another trick is, adding butter or MCT oil or even both to your coffee. It makes your coffee bulletproof and will help your body burn more fat as an energy source.
A ketone level of 0.6 mM* indicates ketosis. Typically, circulating levels of ketones are at ~0.1 mM in the average person after an overnight fast.
Dave Asprey who is the author of the book “Bulletproof Diet”, describes that after drinking a cup of bulletproof coffee, the blood ketone level can reach 0.7mM within 30 minutes.
People on low-carb diets have to restrict their intake of carbohydrates for three days before they can reach the same level.
*mM stands for millimolar. It’s the measuring unit of concentrations expressing the number of moles of the substance (here ketones) present in a defined volume of solution: A 1 millimolar (1 mM) solution contains 1 millimole per litre (1 mmol/l).
Optimum blood ketone levels for nutritional ketosis range from 0.5 to 3.0 mM,
according to Volek and Phinney in their best-selling book “The Art and Science of Low-Carbohydrate Living”.