Ketone bodies Acetone Acetoacetic acid (R)-beta-Hydroxybutyric acid Ketone bodies are three water-soluble molecules (acetoacetate, beta-hydroxybutyrate, and their spontaneous breakdown product, acetone) that are produced by the liver from fatty acids during periods of low food intake (fasting), carbohydrate restrictive diets, starvation, prolonged intense exercise,, alcoholism or in untreated (or inadequately treated) type 1 diabetes mellitus. These ketone bodies are readily picked up by the extra-hepatic tissues, and converted into acetyl-CoA which then enters the citric acid cycle and is oxidized in the mitochondria for energy. In the brain, ketone bodies are also used to make acetyl-CoA into long-chain fatty acids. Ketone bodies are produced by the liver under the circumstances listed above (i.e. fasting, starving, low carbohydrate diets, prolonged exercise and untreated type 1 diabetes mellitus) as a result of intense gluconeogenesis, which is the production of glucose from non-carbohydrate sources (not including fatty acids). They are therefore always released into the blood by the liver together with newly produced glucose, after the liver glycogen stores have been depleted (these glycogen stores are depleted after only 24 hours of fasting). When two acetyl-CoA molecules lose their -CoAs, (or Co-enzyme A groups) they can form a (covalent) dimer called acetoacetate. Beta-hydroxybutyrate is a reduced form of acetoacetate, in which the ketone group is converted into an alcohol (or hydroxyl) group (see illustration on the right). Both are 4-carbon molecules, that can readily be converted back into acetyl-CoA by most tissues of the body, with the notable exception of the liver. Acetone is the decarboxylated form of acetoacetate which cannot be converted Continue reading >>
Urine Ketones - Meanings And False Positives
Professional Reference articles are written by UK doctors and are based on research evidence, UK and European Guidelines. They are designed for health professionals to use. You may find the Urine Ketones article more useful, or one of our other health articles. Description Ketones are produced normally by the liver as part of fatty acid metabolism. In normal states these ketones will be completely metabolised so that very few, if any at all, will appear in the urine. If for any reason the body cannot get enough glucose for energy it will switch to using body fats, resulting in an increase in ketone production making them detectable in the blood and urine. How to test for ketones The urine test for ketones is performed using test strips available on prescription. Strips dedicated to ketone testing in the UK include: GlucoRx KetoRx Sticks 2GK® Ketostix® Mission® Ketone Testing should be performed according to manufacturers' instructions. The sample should be fresh and uncontaminated. Usually the result will be expressed as negative or positive (graded 1 to 4). Ketonuria is different from ketonaemia (ie presence of ketones in the blood) and often ketonuria does not indicate clinically significant ketonaemia. Depending on the testing strips used, urine testing for ketones either has an excellent sensitivity with a low specificity, or a poor sensitivity with a good specificity. However, this should be viewed in the context of uncertainty of the biochemical level of significant ketosis. Interpretation of results Normally only small amounts of ketones are excreted daily in the urine (3-15 mg). High or increased values may be found in: Poorly controlled diabetes. Starvation: Prolonged vomiting. Rapid weight loss. Frequent strenuous exercise. Poisoning (eg, with isop Continue reading >>
Nci Dictionary Of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,214 terms related to cancer and medicine. We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget. Continue reading >>
Ketosis & Measuring Ketones
Generally, ketone concentrations are lower in the morning and higher in the evening. Whatever time you pick to measure ketone levels, make sure to keep it consistent. Also, do not measure your ketone levels right after exercise. Ketone levels tend to be lower while your glucose levels higher so you won't get representative numbers. Keep in mind there are daily fluctuations caused by changes in hormone levels. Don't get discouraged! Another aspect that affects the level of ketones is the amount of fat in your diet. Some of you may show higher concentration of ketones after a high-fat meal. Coconut oil contains MCTs that will help you boost ketones. To easily increase your fat intake on a ketogenic diet, try fat bombs - snacks with at least 80% fat content. Ketone levels tend to be higher after extensive aerobic exercise as your body depletes glycogen stores. Exercise may help you get into ketosis faster. ketogenic "fruity" breath is not pleasant for most people. To avoid this, drink a lot of water, mint tea and make sure you eat foods rich in electrolytes. Avoid too many chewing gums and mints, as it may put you out of ketosis; there may be hidden carbs affecting your blood sugar. Increase your electrolyte intake, especially potassium. You are likely going to lose some sodium and potassium when switching to the keto diet. Finally, if you find it hard to lose weight on a ketogenic diet, there may be plenty other reasons than the level of ketone bodies: Not Losing Weight on Low-Carb Ketogenic Diet? Don’t Give Up and Read Further. Continue reading >>
Clinical Significance Of Positive Urine Ketone Result
Ketone bodies are usually absent in urine. The presence of ketones in the urine probably indicates that the body is using fats rather than carbohydrates for energy. High levels of ketones may be present in the urine of individuals with uncontrolled diabetes because the body's ability to metabolize carbohydrates is defective. Detecting the presence of ketones in the urine is a valuable aid to managing and monitoring individuals with diabetes mellitus. Ketonuria is an indication that the insulin dose needs to be increased. Electrolyte imbalance and dehydration occur when ketones accumulate in the blood. If these conditions are not corrected by adjusting the dose of insulin, the patient may develop ketoacidosis and ultimately diabetic coma. Low levels of ketones may be detected during conditions of physiological stress such as fasting, rapid weight loss, frequent strenuous exercise or prolonged vomiting. The presence of ketones in these situations is due to either inadequate intake of carbohydrates or increased loss of carbohydrates. Continue reading >>
What Are Ketones?
What are ketones and what causes them? Ketones are the result of the body burning fat for energy or fuel. For a person with diabetes, ketones are often the result of prolonged high blood sugar and insulin deficiency. Without the right amount of insulin, glucose starts to build up in the blood stream and doesn't enter the cells. The cells burn fat instead of glucose, and ketones form in the blood and spill into the urine. Some causes of high blood sugar are: Missing an insulin dose or skipping some oral medications. A disconnected or blocked insulin pump tube. Being sick with the flu. High levels of stress. Eating more carbohydrates than your medication covers. What are the signs that I should test for ketones? Symptoms of high blood sugar include frequent urination, frequent thirst, blurry vision, dry mouth, vomiting, and fatigue. There are several scenarios that should prompt a test for ketones. If your blood sugar is over 240 mg/dl for two tests in a row. When you are ill. When your blood sugar is over 240 mg/dl and you are planning on exercising. If you are pregnant, you should test for ketones each morning before breakfast and whenever blood sugars are elevated. How do I test for ketones? There are two ways to test for ketones - by testing your urine or your blood. Ketones appear first in the blood stream and are later present in the urine, so testing your blood for ketones is the best way to check for an early problem. To check urine for ketones, you must collect a urine sample or dip a ketone test strip into a fresh stream of urine. After waiting for the time suggested by the ketone strip manufacturer, you compare the color strip to the chart on the bottle. The darker the color, the higher the amount of ketones in the urine. At this time, there are just a few mete Continue reading >>
Ketones In Urine
I know this is an old post, but people may still be checking for answers. I work in a laboratory where we do urinalysis constantly all day every day. In a pregnant woman, you can see ketones in the urine in two, but separate, circumstances. First is ketones in combination with any urine glucose (sugar) level. This may be a sign of gestational diabetes and you should start asking your doctor questions about it. Second is ketones by themselves. I'm 12 weeks pregnant and had ketones in my urine and was instructed by my doctor to go to the ER and get IV fluids. This was directly related to my eating habits, which at that point were near null because of the morning sickness. Because I was eating so little, and barely able to keep water down, my body was using my fat stores to supply nutrients to the baby. This breakdown of fat in such large amounts causes ketones as a waste product, which is then excreted through your urine. Ketones occur in the absence of carbs, when your body starts to use fat for calories. You will see ketones when you are eating very low calorie, very low carb, or have impaired insulin function. Ketones are concentrated in a state of dehydration. Excess glucose in urine indicates eating too many carbs (if you're diabetic) and/or impaired insulin function. Both are hallmarked by sweet smelling urine. Make sure you eat small meals during the day and add a night time snack, with a protein, to prevent ketosis while sleeping. If you think you have diabetes see a physician. I am 38 weeks pregnant and my urin showed high ketones this week. My blood sugar was in "acceptable" level; however, my doctor said that the presence of ketones in my urine means I need to drink alot more water because my body is converting carbs to sugar faster than I can exp Continue reading >>
The Different Types Of Ketone Supplements
Within the last few years, ketone supplements have become a popular way to support those following a ketogenic diet and striving to maintain a healthy level of ketosis as much as possible. However, a lot of people still don’t really know about the different types of ketone supplements out there and how they can be beneficial for when you go keto. Understanding ketone supplementation is important because you want to make sure you’re getting the most bang for your buck and avoiding any products that don’t do what they claim. Before describing specific ketone supplements, it will help us to refresh on what are exogenous ketones, and why we should take them. This way, we can better understand the role of these ketone bodies for our own health and weight loss goals. What Are Exogenous Ketone Supplements? Ketone supplements are often referred to as exogenous ketones, meaning they are created externally—outside of the body. This is opposed to the ketones your body produces when carbs are restricted and you’re in a state of ketosis. Basically, exogenous ketones are created in a lab and made into supplement form for you to ingest. There are three ketones the body produces when on a ketogenic diet: acetoacetate, beta-hydroxybutyrate (BHB), and acetone. The ketone found in exogenous ketone supplements is BHB. That’s because the body can use it most efficiently. Now let’s take a look at why exogenous ketones are important and beneficial to a keto diet. Benefits of Exogenous Ketone Supplements There will be times when maintaining a steady ketogenic state isn’t realistic 24/7, so the purpose of ketone supplements is to provide the body with extra ketones to use when you aren’t currently in ketosis. Ketone supplements can be a huge help when transitioning into a stat Continue reading >>
What Are Ketones And Their Tests?
A ketone test can warn you of a serious diabetes complication called diabetic ketoacidosis, or DKA. An elevated level of this substance in your blood can mean you have very high blood sugar. Too many ketones can trigger DKA, which is a medical emergency. Regular tests you take at home can spot when your ketone levels run too high. Then you can take insulin to lower your blood sugar level or get other treatments to prevent complications. What Exactly Are Ketones? Everyone has them, whether you have diabetes or not. Ketones are chemicals made in your liver. You produce them when you don't have enough of the hormone insulin in your body to turn sugar (or “glucose”) into energy. You need another source, so your body uses fat instead. Your liver turns this fat into ketones, a type of acid, and sends them into your bloodstream. Your muscles and other tissues can then use them for fuel. For a person without diabetes, this process doesn’t become an issue. But when you have diabetes, things can run out of control and you build up too many ketones in your blood. If the level goes too high, it can become life-threatening. Who Needs a Ketone Test? You might need one if you have type 1 diabetes. In this type, your immune system attacks and destroys cells in your pancreas that make insulin. Without it, your blood sugar rises. People with type 2 diabetes can also get high ketones, but it isn't as common as it is with type 1. Tests can show you when your level gets high so you can treat it before you get sick. When Should You Test? Your doctor will probably tell you to test your ketones when: Your blood sugar is higher than 250 milligrams/deciliter (mg/dl) for two days in a row You're sick or you've been injured You want to exercise and your blood sugar level is over 250 mg/dl Continue reading >>
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Ketones And Aldehydes
Your chemical reactions can be run safely and effectively with US-made clamps and other laboratory accessories from Safety Emporium. According to the International Union of Pure and Applied Chemistry (IUPAC) naming (nomenclature) rules, simple ketones are named by taking the name of the longest acyclic hydrocarbon chain in the molecule, dropping the terminal "e" (if present), and adding the suffix "one". In situations where there are other functional groups that take naming precedence, the ketone may be indicated by the use of "oxo". Certain other ketone-containing substructures have additional naming rules that are beyond the scope of our current discussion: Under IUPAC nomenclature aldehydes are named by taking the name of the longest acyclic hydrocarbon chain in the molecule, dropping the terminal "e" (if present), and adding the suffix "al", "aldehyde" or "carbaldehyde". In some cases the prefix "formyl" may be used. Two aldehydes are indicated by the suffix "dial". In addition, a number of trivial (traditional) names are still recognized. For detailed naming rules see Further Reading below. Aldehydes and ketones are widely used industrial chemicals both as solvents and as chemical intermediates (ingredients for other chemicals). Most can be classified as volatile organic compounds meaning that their vapors may be easily inhaled or ignited. Many ketones and aldehydes are also flammable as liquids and solids. Training materials, handbooks, posters and videos at Safety Emporium can help your employees protect themselves from hazards such as formaldehyde. Important note: formaldehyde is an industrially important aldehyde that is used on the billion ton scale. Glutaraldehyde is a "cold sterilent" used widely in the health care industry. Both are potent sensitizers. Expo Continue reading >>
Ketone Definition A ketone is a compound containing a carbonyl functional group bridging two groups of atoms. The general formula for a ketone is RC(=O)R' where R and R' are alkyl or aryl groups. IUPAC ketone functional group names contain "oxo" or "keto". Ketones are named by changing the -e on the end of the parent alkane name to -one. Examples: Acetone is a ketone. The carbonyl group is connected to the alkane propane, therefore the IUPAC name for acetone would be propanone. Continue reading >>
Ketone Bodies: A Review Of Physiology, Pathophysiology And Application Of Monitoring To Diabetes.
Abstract Ketone bodies are produced by the liver and used peripherally as an energy source when glucose is not readily available. The two main ketone bodies are acetoacetate (AcAc) and 3-beta-hydroxybutyrate (3HB), while acetone is the third, and least abundant, ketone body. Ketones are always present in the blood and their levels increase during fasting and prolonged exercise. They are also found in the blood of neonates and pregnant women. Diabetes is the most common pathological cause of elevated blood ketones. In diabetic ketoacidosis (DKA), high levels of ketones are produced in response to low insulin levels and high levels of counterregulatory hormones. In acute DKA, the ketone body ratio (3HB:AcAc) rises from normal (1:1) to as high as 10:1. In response to insulin therapy, 3HB levels commonly decrease long before AcAc levels. The frequently employed nitroprusside test only detects AcAc in blood and urine. This test is inconvenient, does not assess the best indicator of ketone body levels (3HB), provides only a semiquantitative assessment of ketone levels and is associated with false-positive results. Recently, inexpensive quantitative tests of 3HB levels have become available for use with small blood samples (5-25 microl). These tests offer new options for monitoring and treating diabetes and other states characterized by the abnormal metabolism of ketone bodies. Continue reading >>
Getting To Know Ketones
People with diabetes, particularly those with Type 1 diabetes, have been at least vaguely aware of the word ketones for a long time. With the recent resurgence of popular interest in low-carbohydrate diets, however, just about everyone seems to be talking about ketones these days. But does anyone really know what ketones are? Are they a danger to your health (as in diabetic ketoacidosis), or a sign that you have lowered your carbohydrate intake enough to cause weight loss (as some people who follow low-carbohydrate diets believe)? What are ketones? Ketones are end-products of fat metabolism in the body. That is, they are formed when fat is burned for energy by the muscles. Chemically, they are acids known as ketone bodies, and there are three types: beta-hydroxybutyric acid, aceto-acetic acid, and acetone. But you don’t have to be a chemist to understand what role they play in the body. To get to know ketones, it’s helpful to understand how your body burns fuel. A simple analogy is that of an automobile. For a car engine to run, the engine must burn fuel (gasoline), and when the fuel is burned, exhaust (carbon monoxide) is created. The carbon monoxide is the end-product of gasoline combustion. Your body also has an engine that must burn fuel to operate. The engine is muscle, and the fuel is fat, carbohydrate (glucose), and, in certain conditions, protein. When fat is burned, the “exhaust” is ketones, and when glucose is burned, the “exhaust” is lactic acid. Fat is more desirable as a fuel than glucose because there are more calories in a gram of fat (9 calories per gram) than there are in a gram of glucose (4 calories per gram), so you get more energy per gram of fat burned. In a sense, you could call fat a high-test fuel. But there is one catch to burning f Continue reading >>
Acetoacetate, beta-hydroxybutyrate, and acetone are ketone bodies. In carbohydrate-deficient states, fatty-acid metabolism spurs acetoacetate accumulation. The reduction of acetoacetate in the mitochondria results in beta-hydroxybutyrate production. Beta-hydroxybutyrate and acetoacetate, the predominant ketone bodies, are rich in energy. Beta-hydroxybutyrate and acetoacetate transport energy from the liver to other tissues. Acetone forms from the spontaneous decarboxylation of acetoacetate. Acetone is the cause of the sweet odor on the breath in persons with ketoacidosis. [1, 2] Ketone bodies fuel the brain with an alternative source of energy (close to two thirds of its needs) during periods of prolonged fasting or starvation, when the brain cannot use fatty acids for energy. The reference range for ketone is a negative value, at less than 1 mg/dL (< 0.1 mmol/L).  Continue reading >>
What Is Ketone? - Definition, Structure, Formation & Formula
Background of Ketone Did you know that our friend aldehyde has a very close relative named ketone? By definition, a ketone is an organic compound that contains a carbonyl functional group. So you may be wondering if aldehydes and ketones are relatives, what makes them different? Well, I am glad you asked because all you have to remember is this little guy: hydrogen. While aldehyde contains a hydrogen atom connected to its carbonyl group, ketone does not have a hydrogen atom attached. There are a few ways to know you are encountering a ketone. The first is by looking at the ending of the chemical word. If the suffix ending of the chemical name is '-one,' then you can be sure there is a ketone present in that compound. Want to know another way to tell if a ketone is lurking around the corner? By its physical property. Ketones have high boiling points and love water (high water solubility). Let's dig a little deeper with the physical property of a ketone. The oxygen in a ketone absolutely loves to take all the electrons it can get its hands on. But, by being an electron-hogger, oxygen's refusal to share creates a sticky situation where some atoms on the ketone have more or less charge than others. In chemistry, an electron-hogging atom is referred to as being electronegative. An electronegative atom is more attractive to other compounds. This attractiveness, called polarity, is what contributes to ketones' physical properties. Structure & Formula Ketones have a very distinct look to them; you can't miss it if you see them. As shown in Diagram 1, there are two R groups attached to the carbonyl group (C=O). Those R groups can be any type of compound that contains a carbon molecule. An example of how the R group determines ketone type is illustrated in this diagram here. The Continue reading >>