Beta-Hydroxybutyrate (BHB) – Ketone Body Explained
Beta-hydroxybutyrate (BHB) is a ketone body produced by the liver from fatty acids, serving as an alternative energy source during fasting or low-carbohydrate diets.
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Beta-hydroxybutyrate (BHB) is a ketone body produced by the liver from fatty acids, serving as an alternative energy source during fasting or low-carbohydrate diets.
What is Beta-Hydroxybutyrate?
Beta-hydroxybutyrate (also written as betahydroxybutyrate, abbreviated as BHB) is an organic molecule belonging to the group of ketone bodies. It is primarily produced in the liver when the body does not have sufficient carbohydrates available for energy – such as during fasting, a very low-carbohydrate (ketogenic) diet, or prolonged intense exercise. Chemically, BHB belongs to the beta-hydroxy acids and its systematic name is 3-hydroxybutanoic acid.
Formation and Metabolism
When the body´s glycogen stores in the liver and muscles are depleted, it begins to break down fatty acids at an increased rate – a process known as lipolysis. The resulting fatty acids are converted in the liver to acetyl-CoA, which is then processed into the three ketone bodies:
- Beta-hydroxybutyrate (BHB) – the most abundant ketone body
- Acetoacetate
- Acetone
BHB is transported via the bloodstream to various organs, where it is used as an energy source – particularly by the brain, heart, and muscles. Unlike most other organs, the brain cannot directly utilize fatty acids and therefore relies on ketone bodies like BHB when glucose is scarce.
Physiological Importance
Beta-hydroxybutyrate plays several important roles in human metabolism:
- Energy supply: BHB efficiently provides the body with energy even without glucose – especially for the brain and heart.
- Neuroprotective effects: Studies suggest that BHB may have anti-inflammatory and neuroprotective properties.
- Signaling molecule: BHB functions not only as an energy carrier but also as an epigenomic signaling molecule capable of influencing gene expression.
- Inhibition of the NLRP3 inflammasome: BHB can suppress certain inflammatory processes at the cellular level.
Beta-Hydroxybutyrate and Ketosis
An elevated BHB level in the blood is the primary hallmark of ketosis – a metabolic state that can be induced through a low-carbohydrate diet, fasting, or intense physical activity. Ketosis is considered physiologically normal and safe as long as BHB levels remain moderate. It is important to distinguish ketosis from diabetic ketoacidosis (DKA), a dangerous condition in uncontrolled type 1 diabetes mellitus in which BHB levels rise dramatically and the blood becomes acidic.
Measurement of Beta-Hydroxybutyrate
BHB can be measured in the blood or urine. Blood measurement is considered more accurate and is used both in medical diagnostics and by individuals monitoring their own ketosis. Normal fasting blood values are below 0.5 mmol/l. During nutritional ketosis, levels typically range between 0.5 and 3.0 mmol/l. Values above 10 mmol/l may indicate ketoacidosis.
Exogenous Ketones and Supplementation
In addition to endogenous production, BHB is also available as a so-called exogenous ketone in the form of dietary supplements – commonly as BHB salts (e.g., sodium BHB, potassium BHB, magnesium BHB) or ketone esters. These products are used by athletes for performance enhancement, cognitive support, and to accelerate the transition into ketosis. The scientific evidence for most of these applications is still emerging and not yet conclusive.
Medical Applications
BHB and ketogenic dietary strategies that raise BHB levels are being researched and applied in various medical fields:
- Epilepsy: The ketogenic diet is a recognized therapy for drug-resistant epilepsy, particularly in children.
- Neurological conditions: Research into Alzheimer disease, Parkinson disease, and other neurodegenerative conditions shows promising results.
- Type 2 diabetes and metabolic syndrome: Ketogenic nutrition can lower blood glucose and insulin levels.
- Cancer research: BHB and ketone bodies are being studied in connection with the Warburg hypothesis.
References
- Cahill GF Jr. - Fuel metabolism in starvation. Annual Review of Nutrition, 2006; 26:1-22.
- Newman JC, Verdin E. - Ketone bodies as signaling metabolites. Trends in Endocrinology and Metabolism, 2014; 25(1):42-52.
- Poff AM et al. - Ketone supplementation decreases tumor cell viability and prolongs survival of mice with metastatic cancer. International Journal of Cancer, 2014; 135(7):1711-1720.
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