The two compounds commonly referred to as ‘ketone bodies’ (BOHB and AcAc) are produced and used for multiple purposes across nature from algae to mammals, but seldom in concentrations useful for extraction as human food. For this reason, the source of most exogenous ketones is chemical synthesis. Furthermore, most current research and use of ketone supplements focuses on BOHB. That is because AcAc is chemically unstable – it slowly breaks down to form acetone by releasing of one molecule of CO2.
This may have been mentioned, I haven’t checked all comments, but glutamine causes gluconeogenesis so that may explain why it affects Ketosis. Whenever I took a glutamine powder supplement for gut healing, I noticed I would “feel” less Ketogenic and I knew it was affecting me adversely. Glycine (which is also in bone broth) also has this effect I believe. Apparently some amino acids are just more easily converted to glucose.
For the ketone esters, on the other hand, repeated doses of 20-30 grams in any one day may be possible. Thus these products may be able to maintain a modest level of ketonemia without dietary carbohydrate restriction. Thus some of the cardiac and brain fueling benefits may follow, not to mention the epigenetic effects limiting oxidative stress and inflammation. But given the recent observation that administered ketone esters markedly reduce circulating free fatty acids (Myette-Cote 2018) — possibly due to an insulin-tropic effect or direct suppression of lipolysis (Taggart 2005) — their sustained use in people with underlying insulin resistance may compromise their long-term benefits by promoting weight gain unless combined with carbohydrate restriction.
Too much cortisol tells the liver that you are in physical danger and need a lot of energy fast. The brain doesn’t understand the difference between physical danger and emotional stress. When emotionally stressed, the brain thinks you’re in a life-and-death situation, so the liver comes to your rescue and gives you the glucose you need to fight off your attacker.
For the past few million years, the only way for humans to make use of ketones for fuel was to restrict carbohydrates low enough and long enough to induce the liver to make them. This is admittedly hard for many people to do in a world that still believes that dietary carbs are good and fats are bad. An emerging alternative is to consume ketones as a dietary supplement. The research into how these function in the body and what benefits they can confer remains early stage, but there are already a number of such products available for sale. In this section, we will discuss how exogenous ketones affect blood ketone levels, and how they may influence health and disease compared to ketones produced within the body.
A common question is why BHB is the go-to ketone body for exogenous ketone supplements. The likely reason is a combination of its efficient conversion into energy and its ease of formulation. In other words, that it is easier to formulate BHB into a nutritional supplement. And the body efficiently converts BHB to acetoacetic acid, which effectively raises blood ketone levels.
BHB easily crosses the blood-brain barrier resulting in easily accessible energy to the brain and muscle tissues, becoming a source of energy after entering the mitochondria, being converted to Acetyl-CoA, and then ATP through the Krebs cycle (the same process that glucose goes through to become ATP). This ultimately results in many direct benefits, including:
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