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Ketosis is a metabolic state characterized by elevated levels of ketone bodies in the blood. Physiologic ketosis is a normal response to low glucose availability, such as low-carbohydrate diets or fasting, that provides an additional energy source for the brain in the form of ketones. In physiologic ketosis, ketones in the blood are elevated above baseline levels but the body's acid-base homeostasis is maintained. This contrasts with ketoacidosis, an uncontrolled production of ketones that occurs in pathologic states and causes a metabolic acidosis, which is a medical emergency. Ketoacidosis is most commonly the result of complete insulin deficiency in type 1 diabetes or late-stage type 2 diabetes.

Ketosis
Ketone bodies.png
Ketone bodies: acetone, acetoacetic acid, and beta-hydroxybutyric acid
Pronunciation
SpecialtyEndocrinology

Trace levels of ketones are always present in the blood and increase when blood glucose reserves are low and the liver shifts from primarily metabolizing carbohydrates to metabolizing fatty acids.[1] This occurs during states of increased fatty acid oxidation such as fasting, starvation, carbohydrate restriction, or prolonged exercise. When the liver rapidly metabolizes fatty acids into acetyl-CoA, some acetyl-CoA molecules can then be converted into ketone bodies: acetoacetate, beta-hydroxybutyrate, and acetone.[1][2] These ketone bodies can function as an energy source as well as signalling molecules.[3] The liver itself cannot utilize these molecules for energy so the ketone bodies are released into the blood for use by peripheral tissues including the brain.[1]

Ketosis is generally characterized by serum concentrations of ketone bodies over 0.5 mM, which can be measured in blood, urine, or breath testing.[2] When ketosis is induced by carbohydrate restriction, it is sometimes referred to as nutritional ketosis. A low-carbohydrate, high fat diet that can lead to ketosis is called a ketogenic diet. Nutritional ketosis alone does not progress to ketoacidosis and its safety is supported in trials up to two years, although research on longer term ketosis is lacking. Ketosis is well-established as a treatment for epilepsy and is also effective in treating type 2 diabetes. Benefit in a range of neurological diseases, cancer, and other conditions is currently under investigation.

DefinitionEdit

Physiologic ketosisEdit

Physiologic ketosis is a normal physiologic state characterized by elevated serum ketones and normal blood glucose and blood pH.[4] Increasing production of ketone bodies is a response to low glucose availability that creates an alternate energy source for the brain. Physiologic ketosis can result from any state that increases fatty acid oxidation including fasting, prolonged exercise, or very low-carbohydrate diets such as the ketogenic diet.[1][3][5] Ketone levels generally remain below 3 mM.[2]

KetoacidosisEdit

See Ketoacidosis

Ketoacidosis is a pathological state of uncontrolled production of ketones that results in a metabolic acidosis. Ketoacidosis and is most commonly caused by a deficiency of insulin in type 1 diabetes or late stage type 2 diabetes, but can also be the result of chronic heavy alcohol use, salicylate poisoning, or isopropyl alcohol ingestion.[1][2] Ketoacidosis causes significant metabolic derangements and is a life threatening medical emergency.[1] Ketoacidosis is distinct from physiologic ketosis as it requires failure of the normal regulation of ketone body production.[5][4]

CausesEdit

Increased ketone production can result from any state that increases fatty acid oxidation including fasting, prolonged exercise, or very low-carbohydrate diets such as the ketogenic diet.[1][3][5] This will cause a controlled production of ketones while blood glucose and blood pH remain normal.[4] When glycogen and blood glucose reserves are low, a metabolic shift occurs in order to save glucose for the brain which is unable to use fatty acids for energy. This shift involves increasing fatty acid oxidation and production of ketones in the liver as an alternate energy source for the brain as well as the skeletal muscles, heart, and kidney.[1][3] Low levels of ketones are always present in the blood and increase under circumstances of low glucose availability. For example, after an overnight fast 2-6% of energy comes from ketones and this increases to 30-40% after a 3 day fast.[1][2]

The amount of carbohydrate restriction required to induce a state of ketosis is variable and depends on activity level, insulin sensitivity, genetics, age and other factors but ketosis will usually occur when consuming less than 50 grams of carbohydrates per day for at least three days.[6][7] Ketosis induced by carbohydrate restriction is sometimes referred to as nutritional ketosis.[8]

Neonates, pregnant women and lactating women are populations that develop physiologic ketosis especially rapidly in response to energetic challenges such as fasting or illness. This can progress to ketoacidosis in the setting of illness although occurs rarely. Propensity for ketone production in neonates is due to their high-fat breast milk diet, disproportionally large central nervous system and limited liver glycogen.[2][9]

Ketosis can also be induced by consumption of ketogenic fats (such as medium chain triglycerides) or consuming exogenous ketones in foods or supplements.[10]

BiochemistryEdit

The precursors of ketone bodies include fatty acids from adipose tissue or the diet and ketogenic amino acids.[11][12] The formation of ketone bodies occurs via ketogenesis in the mitochondrial matrix of liver cells.

Fatty acids can be released from adipose tissue by adipokine signaling of high glucagon and epinephrine levels and low insulin levels. High glucagon and low insulin correspond to times of low glucose availability such as fasting.[13] Fatty acids bound to coenzyme A to allow penetration into mitochondria. Once inside the mitochondrion, the bound fatty acids are used as fuel in cells prominently through β-oxidation, which cleaves two carbons from the acyl-CoA molecule in every cycle to form acetyl-CoA. Acetyl-CoA enters the citric acid cycle, where it undergoes an aldol condensation with oxaloacetate to form citric acid; citric acid then enters the tricarboxylic acid cycle (TCA), which harvests a very high energy yield per carbon in the original fatty acid.[14]

Acetyl-CoA can be metabolized through the TCA cycle in any cell, but it can also undergo ketogenesis in the mitochondria of liver cells.[2] When glucose availability is low, oxaloacetate is diverted away from the TCA cycle and is instead used to produce glucose via gluconeogenesis. This utilization of oxaloacetate in gluconeogenesis can make it unavailable to condense with acetyl-CoA, preventing entrance into the TCA cycle. In this scenario, energy can be harvested from acetyl-CoA through ketone production.

In ketogenesis, two acetyl-CoA molecules condense to form acetoacetyl-CoA via thiolase. Acetoacetyl-CoA briefly combines with another acetyl-CoA via HMG-CoA synthase to form hydroxy-β-methylglutaryl-CoA. Hydroxy-β-methylglutaryl-CoA form the ketone body acetoacetate via HMG-CoA lyase. Acetoacetate can then reversibly convert to another ketone body—D-β-hydroxybutyrate—via D-β-hydroxybutyrate dehydrogenase. Alternatively, acetoacetate can spontaneously degrade to a third ketone body (acetone) and carbon dioxide, which generates much greater concentrations of acetoacetate and D-β-hydroxybutyrate. The resulting ketone bodies cannot be used for energy by the liver so are exported from the liver to supply energy to the brain and peripheral tissues.

In addition to fatty acids, deaminated ketogenic amino acids can also be converted into intermediates in the citric acid cycle and produce ketone bodies.[12]

MeasurementEdit

Ketone levels can be measured by testing urine, blood or breath. There are limitations in directly comparing these methods as they measure different ketone bodies.

Urine testingEdit

 
Test for ketonuria using Bayer Ketostix reagent strips

Urine testing is the most common method of testing for ketones. Urine test strips utilize a nitroprusside reaction with acetoacetate to give a semi-quantitative measure based on color change of the strip. Although beta-hydroxybutyrate is the predominant circulating ketone, urine test strips only measure acetoacetate and not beta-hydroxybutyrate. Urinary ketones often correlate poorly with serum levels due variability in excretion of ketones by the kidney, influence of hydration status and renal function.[2][7]

Serum testingEdit

Fingerstick ketone meters allow instant testing of beta-hydroxybutyrate levels in the blood, similar to glucometers. Beta-hydroxybutrate levels can also be measured in blood in a laboratory.[2]

Breath testingEdit

Handheld devices are now available that measure acetone as an estimate of ketosis. Validation of this measure and correlation with circulating ketones is currently mixed as this is a new technology with inconsistent measurement protocols.[15]

Medical usesEdit

EpilepsyEdit

See Ketogenic diet

Ketosis induced by a ketogenic diet is a long-accepted treatment for refractory epilepsy.[16] It was first used in the 1920s and is now widely implemented for pediatric and adult patients.[17]

Type 2 diabetesEdit

Ketosis induced by a very low-carbohydrate diet is supported as an effective treatment for type 2 diabetes and can improve blood glucose metrics even with reduction or discontinuation of antidiabetic medications.[6][8][18] Ketosis can be an effective treatment for this population by reducing dietary glucose load, increasing insulin sensitivity as well as reducing hepatic glucose output. This results in reduction in fasting glucose and insulin and hemoglobin A1c as well as reduced need for exogenous insulin.[8][19] Its widespread use has been limited by concerns remain about the sustainability and long term adherence to the diet.[18][20]

Obesity and metabolic syndromeEdit

See Low-carbohydrate diet

Very-low carbohydrate diets inducing ketosis have shown to be effective in weight loss although superiority over calorie restricted diets continues to be debated.[18] Ketosis can improve markers of metabolic syndrome through reduction in serum triglycerides, elevation in high-density lipoprotein as well as increased size and volume of low-density lipoprotein particles. These changes are consistent with an improved lipid profile despite potential increases in total cholesterol level.[6][8][19]

Emerging evidence in other conditionsEdit

Ketosis is being investigated for a growing number of conditions, however clinical recommendations for these conditions cannot yet be made based on the current level of evidence.

Neurological diseases: In addition to its use for epilepsy, ketosis is being investigated in other neurological diseases due to its proposed neuroprotective effects[21] including Alzheimer's disease (AD), amyotrophic lateral sclerosis (ALS), autism, headache, neurotrauma, pain, Parkinson's disease, and sleep disorders.[17]

Cancer: Preclinical studies have indicated ketosis may have anti-tumor effects, however clinical trials have been limited by small sample sizes and not shown conclusive benefit.[22]

Other conditions: There is emerging evidence for the use of ketosis in other conditions such as type 1 diabetes, non-alcoholic fatty liver disease, acne and polycystic ovary syndrome, however evidence quality is limited by small sample sizes.[6][8][18]

SafetyEdit

The safety of ketosis from low-carbohydrate diets is often called into question by clinicians, researchers and the media.[23][24][25] A common safety concern stem from the misunderstanding of the difference between physiologic ketosis and pathologic ketoacidosis.[4][6][19] There is also continued debate whether chronic ketosis is a healthy state or a stressor to be avoided. Some argue that we evolved to avoid ketosis and should not be in ketosis long-term.[25] The counter-argument is that there is no physiologic requirement for dietary carbohydrate as adequate energy can be made via gluconeogenesis and ketogenesis indefinitely.[20] Alternatively, the switching between a ketotic and fed state has been proposed to have beneficial effects on metabolic and neurologic health.[3] The safety of ketosis up to two years is supported by studies of people following a strict ketogenic diet for epilepsy or type 2 diabetes without adverse events.[26] However, literature on longer term effects or intermittent ketosis is lacking.[18][26]

Medication considerationsEdit

Some medications require attention when in a state of ketosis, especially several classes of diabetes medication. SGLT2 inhibitor medications have been associated with cases of euglycemic ketoacidosis- a rare state of high ketones causing a metabolic acidosis with normal blood glucose levels. This usually occurs with missed insulin doses, illness, dehydration or adherence to a low-carbohydrate diet while taking the medication.[27] Additionally, medications used to directly lower blood glucose including insulin and sulfonylureas may cause hypoglycemia if they are not titrated prior to starting a diet that results in ketosis.[26]

Adverse effectsEdit

The most common side effects of ketosis include headache, fatigue, dizziness, insomnia, difficulty in exercise tolerance, and constipation, and nausea especially in the first days and weeks after starting a ketogenic diet.[26] Breath may develop a sweet, fruity flavor due to production of acetone that is exhaled due to its high volatility.[6]

Most adverse effects of long-term ketosis reported are in children due to its longstanding acceptance as a treatment for pediatric epilepsy. These include compromised bone health, stunted growth, hyperlipidemia, and kidney stones.[28]

ContraindicationsEdit

Ketosis induced by a ketogenic diet should not be pursued by people with pancreatitis due to high dietary fat content. Ketosis is also contraindicated in pyruvate carboxylase deficiency, porphyria, and other rare genetic disorders of fat metabolism.[29]

Culture and societyEdit

Inuit populationsEdit

The Inuit population are often cited as an example of a population thriving on a long term low-carbohydrate, fat-based diet in the form of their traditional Inuit cuisine.[30] However, it is unclear if their diet causes a prolonged state of ketosis as ketone levels in this population are lower than expected when tested.[30][31] This may be due to limitations in urine ketone testing, adaptation to a long-term ketogenic diet, higher than expected dietary carbohydrate, or genetic factors. Inuit consume calories from carbohydrates from the glycogen found in raw meats as well as available plant matter such as mosses and lichens which may be above the carbohydrate allotment to achieve consistent ketosis.[31][32] It has also been proposed that the high prevalence of Carnitine palmitoyltransferase I (CPT1A) deficiency among the Inuit may contribute to lower ketone levels as the mutation prevents normal ketone production due to impaired transport of fatty acids across the mitochondrial membrane.[30][33] CPT1A deficiency is an autosomal recessive allele, predisposing homozygotes to dangerous hypoketotic hypoglycemia during fasting, infant death, hepatomegaly, and hypoglycemia, however heterozygote carriers may have a selective advantage in extreme cold environments due to shunting of free fatty acids to brown fat for thermogenesis[33][34]

Veterinary medicineEdit

In dairy cattle, ketosis commonly occurs during the first weeks after giving birth to a calf and is sometimes referred to as acetonemia. This is the result of an energy deficit when intake is inadequate to compensate for the increased metabolic demand of lactating. The elevated β-hydroxybutyrate concentrations can depress gluconeogenesis, feed intake and the immune system as well as have an impact on milk composition.[35] Point of care diagnostic tests can be useful to screen for ketosis in cattle.[36]

In sheep, ketosis, evidenced by hyperketonemia with beta-hydroxybutyrate in blood over 0.7 mmol/L, is referred to as pregnancy toxemia.[37][38] This may develop in late pregnancy in ewes bearing multiple fetuses and is associated with the considerable metabolic demands of the pregnancy.[39][40] In ruminants, because most glucose in the digestive tract is metabolized by rumen organisms, glucose must be supplied by gluconeogenesis.[41] Pregnancy toxemia is most likely to occur in late pregnancy due to metabolic demand from rapid fetal growth and may be triggered by insufficient feed energy intake due to weather conditions, stress or other causes.[38] Prompt recovery may occur with natural parturition, Caesarean section or induced abortion. Prevention through appropriate feeding and other management is more effective than treatment of advanced stages of pregnancy toxemia.[42]

See alsoEdit

ReferencesEdit

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