Do Ketones Mean You're Burning Fat? High Ketone Levels & Tests (2024)

  • Ketosis and Weight Loss
    • How does ketosis help burn body fat?
  • Tests of Ketone Levels
    • How can you measure ketone levels?
  • High Ketone Levels
    • Are there dangers to being in ketosis?
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Do Ketones Mean You're Burning Fat? High Ketone Levels & Tests (1)

Ketone levels in your blood need to be between 0.5-3 mg/dL for your body to achieve optimal ketosis, which is the ideal state for weight loss.

Yes, having a certain amount of ketones in your blood, urine or breath means that your body is burning fat.

Ketone levels in your blood need to be between 0.5-3 mg/dL for your body to achieve optimal ketosis, which is the ideal state for weight loss. At this point, your hunger hormones reset, leaving you feeling satiated so that you don’t eat as much.

How does ketosis help burn body fat?

Normally, your body uses carbohydrates as a preferred source of energy. However, when the number of stored carbohydrates in your body (stored glycogen in your liver) decreases, this forces your body to turn to using stored fat for fuel

During ketosis, your liver breaks down fats into substances called ketones, which are byproducts of fat metabolism. Ketosis can be achieved by fasting, switching to a low-carb diet, or following a ketogenic (keto) diet (low-carb, high-fat). Combining a keto diet and exercise helps you reach ketosis faster.

When your body is in ketosis, it is burning fat at such high rates that ketones can be detected in your blood, urine, or breath. And the level of ketones indicates the amount of fat being burned. However, to reap the benefits of ketosis without the harmful side effects, ketone levels should still be less than 3 mg/dL.

How can you measure ketone levels?

You can measure your ketone levels during ketosis in one of three ways:

  1. Urine ketone strips: Urine ketone strips are relatively inexpensive and can give you a rough idea of ketone levels in your body, although results may be slightly inaccurate.
  2. Blood ketone tests: Blood ketone tests are the most accurate and most expensive way of measuring your ketone levels. They are performed using a kind of blood glucose meter that also helps test for ketones.
  3. Breathalyzer: A breathalyzer can detect ketones in your breath. Results are less accurate than blood ketone tests but more accurate than urine ketone strips. While the initial cost of a breathalyzer device is pretty high, it’s still a one-time investment that allows you to check your ketone levels frequently without worrying about additional costs each time you want to do a test.

In order to determine what ketone levels are optimal for each type of test, speak to your doctor.

Are there dangers to being in ketosis?

To achieve ketosis, you need to lower your carb intake to less than 50 grams per day. It usually takes about 4-12 weeks to adapt to a keto diet, during which time you may experience what some call “keto flu”—a group of symptoms that may appear as your body adjusts. Symptoms of keto flu include

Drinking plenty of water can help ease or keep some of these symptoms at bay.

Ketone levels higher than 10 mg/dL are dangerous. If you are on a keto diet and feel extreme symptoms of keto flu, you need to keep measuring ketone levels in your body at regular intervals to ensure that they aren’t too high. This is particularly important if you have diabetes or consume a lot of alcohol.

  • High ketone levels can lead to a life-threatening condition called ketoacidosis.

Following an aggressive keto diet can also cause dehydration and electrolyte imbalances. If you have conditions such as kidney disease, liver disease, or diabetes, ask your doctor before starting a keto diet.

Do Ketones Mean You're Burning Fat? High Ketone Levels & Tests (2)

QUESTION

Weight loss occurs in the belly before anywhere else. See Answer

References

Hernandez A, Truckenbrod L, Federico Q, et al. Metabolic Switching Is Impaired by Aging and Facilitated By Ketosis Independent of Glycogen. Aging (Albany NY). 2020;12(9):7963-7984. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7244089/

Cleveland Clinic. What Is the Keto Diet (and Should You Try It)? https://health.clevelandclinic.org/what-is-the-keto-diet-and-should-you-try-it/

Gershuni VM, Yan SL, Medici V. Nutritional Ketosis for Weight Management and Reversal of Metabolic Syndrome. Curr Nutr Rep. 2018;7(3):97-106. https://pubmed.ncbi.nlm.nih.gov/30128963/

Do Ketones Mean You're Burning Fat? High Ketone Levels & Tests (2024)

FAQs

Do Ketones Mean You're Burning Fat? High Ketone Levels & Tests? ›

Yes, having a certain amount of ketones in your blood, urine or breath means that your body is burning fat. Ketone levels in your blood need to be between 0.5-3 mg/dL for your body to achieve optimal ketosis, which is the ideal state for weight loss.

What ketone level is good for fat burning? ›

So, what should my ideal ketone level be for weight loss? If measuring with a blood ketone meter, optimal ketone range is 0.5 to 3.0 milligrams per deciliter (mg/dL). If you're using a breath testing device, 2 to 40 parts per million (ppm) is ideal.

Why am I getting high ketone readings? ›

If your body breaks down fat too fast, ketones can build up in your blood and urine. High ketone levels make your blood too acidic. This is a serious condition called ketoacidosis. The most common type of ketoacidosis is a complication of diabetes called diabetic ketoacidosis (DKA).

How do I know if I'm burning ketones? ›

Ketosis is defined as a natural metabolic process that involves the production of energy from the breakdown of fat into ketone bodies. Signs that suggest you are in ketosis include fatigue, bad breath, dry mouth, weight loss, flu-like symptoms, and decreased hunger and thirst.

Can you have high ketones and not lose weight? ›

To lose weight, a person needs to burn more calories than they consume. People who consume too many calories may gain weight, even if they are in a state of ketosis.

Does high ketones mean you're burning fat? ›

When your body burns fat instead of glucose, this leads to elevated ketone levels, which is called ketosis. Symptoms can include changes in the way your breath smells, appetite, and energy levels.

Does more ketones mean more fat burning? ›

Do More Ketones Enhance Fat Loss? Contrary to what you may have heard, high levels of ketones will not guarantee enhanced fat loss. When you are in ketosis, the level of ketones in your bloodstream won't tell you how much fat you are burning. It will only tell you how much energy you currently have in your "fuel tank".

What is an unhealthy ketone level? ›

Checking your blood glucose and ketones

under 0.6mmol/L is normal. 0.6 to 1.5mmol/L is slightly high – test again in 2 hours. 1.6 to 3mmol/L means you're at risk of DKA and should speak to your diabetes care team for advice. over 3mmol/L is high and means you may have DKA and should call 999 or go to A&E.

Does drinking water reduce ketones? ›

If your test shows a trace amount of ketones, it may mean your levels are starting to build. What you can do to bring down your ketone levels: Drink extra water to flush them out of your body. Test your blood sugar every 3 to 4 hours.

What ketone levels indicate ketosis? ›

The hallmark of nutritional ketosis is blood ketone levels of 0.5 to 3 mg/dL. This is in stark contrast to, and should not be confused with, the pathophysiologic state of type 1 diabetic ketoacidosis (DKA). Despite similar sounding names, they are two distinct metabolic processes.

Is 8.0 a good ketone level? ›

When ketone levels rise above 7 or 8 mmol/L, it may indicate a dangerous condition called ketoacidosis. [*] (Note: ketoacidosis may begin as low as 3 mmol/L for type 1 diabetics). Ketoacidosis primarily plagues type 1 diabetics because they lack the proper mechanisms to shut down fat-burning.

When is the best time to test for ketones? ›

Conclusions: These results indicate that ketonuria in subjects with stable ketosis is highest and can be most reliably detected in the early morning and post-dinner urine.

How long does it take for ketones to burn fat? ›

It can take 2-4 days or longer to start losing weight in ketosis, although the rate of weight loss depends on various factors such as your metabolism, carb-protein-fat intake, fitness level, and how strictly you follow the diet.

Why did I gain a pound overnight on keto? ›

Sudden weight gain on keto is often due to an overconsumption of fats like coconut oil, butter, olive oil, and other types of oils and fats. While these ingredients are perfectly acceptable on the keto diet, too much can lead to sudden weight gain.

What are symptoms of too many ketones? ›

Symptoms might include:
  • Being very thirsty.
  • Urinating often.
  • Feeling a need to throw up and throwing up.
  • Having stomach pain.
  • Being weak or tired.
  • Being short of breath.
  • Having fruity-scented breath.
  • Being confused.

How long is it safe to be in ketosis? ›

Gulotta recommends staying on keto for six months max before reintroducing more carbs to your diet. And Scott Keatley, RDN, of Keatley Medical Nutrition Therapy in New York City, agrees: “The science hasn't gotten to the point where I would be comfortable recommending it as a forever diet,” he says.

What is a safe ketone level for ketosis? ›

As described by Volek and Phinney, a “well-formulated” ketogenic diet is composed of 5–10% carbohydrates (<20–50g/day), adequate protein (1–1.5g/kg/day), and fat until satiated. The hallmark of nutritional ketosis is blood ketone levels of 0.5 to 3 mg/dL.

What level of ketones put you in ketosis? ›

When you're in ketosis, your blood ketone level is at least 0.5 millimoles per litre (mmol/L), which is around 9 mg/dL. If a person has ketoacidosis, this level is around 5–10 times higher.

What is the optimal blood sugar level for fat burning? ›

However, a good rule of thumb is to stick to 70-85 mg/dL. This blood sugar level is optimal for burning fat and makes you less liable to insulin resistance, diabetes, heart disease, and an assortment of conditions.

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